fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <[email protected]>
  10  *  Andy Adamson   <[email protected]>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57 #include <linux/iversion.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "sysfs.h"
  67 #include "nfs4idmap.h"
  68 #include "nfs4session.h"
  69 #include "fscache.h"
  70 #include "nfs42.h"
  71
  72 #include "nfs4trace.h"
  73
  74 #define NFSDBG_FACILITY         NFSDBG_PROC
  75
  76 #define NFS4_BITMASK_SZ         3
  77
  78 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  79 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  80
  81 /* file attributes which can be mapped to nfs attributes */
  82 #define NFS4_VALID_ATTRS (ATTR_MODE \
  83         | ATTR_UID \
  84         | ATTR_GID \
  85         | ATTR_SIZE \
  86         | ATTR_ATIME \
  87         | ATTR_MTIME \
  88         | ATTR_CTIME \
  89         | ATTR_ATIME_SET \
  90         | ATTR_MTIME_SET)
  91
  92 struct nfs4_opendata;
  93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
  97                               struct nfs_fattr *fattr, struct inode *inode);
  98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
  99                             struct nfs_fattr *fattr, struct iattr *sattr,
 100                             struct nfs_open_context *ctx, struct nfs4_label *ilabel);
 101 #ifdef CONFIG_NFS_V4_1
 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
 103                 const struct cred *cred,
 104                 struct nfs4_slot *slot,
 105                 bool is_privileged);
 106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 107                 const struct cred *);
 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 109                 const struct cred *, bool);
 110 #endif
 111
 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 113 static inline struct nfs4_label *
 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 115         struct iattr *sattr, struct nfs4_label *label)
 116 {
 117         int err;
 118
 119         if (label == NULL)
 120                 return NULL;
 121
 122         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 123                 return NULL;
 124
 125         label->lfs = 0;
 126         label->pi = 0;
 127         label->len = 0;
 128         label->label = NULL;
 129
 130         err = security_dentry_init_security(dentry, sattr->ia_mode,
 131                                 &dentry->d_name, NULL,
 132                                 (void **)&label->label, &label->len);
 133         if (err == 0)
 134                 return label;
 135
 136         return NULL;
 137 }
 138 static inline void
 139 nfs4_label_release_security(struct nfs4_label *label)
 140 {
 141         if (label)
 142                 security_release_secctx(label->label, label->len);
 143 }
 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 145 {
 146         if (label)
 147                 return server->attr_bitmask;
 148
 149         return server->attr_bitmask_nl;
 150 }
 151 #else
 152 static inline struct nfs4_label *
 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 154         struct iattr *sattr, struct nfs4_label *l)
 155 { return NULL; }
 156 static inline void
 157 nfs4_label_release_security(struct nfs4_label *label)
 158 { return; }
 159 static inline u32 *
 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 161 { return server->attr_bitmask; }
 162 #endif
 163
 164 /* Prevent leaks of NFSv4 errors into userland */
 165 static int nfs4_map_errors(int err)
 166 {
 167         if (err >= -1000)
 168                 return err;
 169         switch (err) {
 170         case -NFS4ERR_RESOURCE:
 171         case -NFS4ERR_LAYOUTTRYLATER:
 172         case -NFS4ERR_RECALLCONFLICT:
 173         case -NFS4ERR_RETURNCONFLICT:
 174                 return -EREMOTEIO;
 175         case -NFS4ERR_WRONGSEC:
 176         case -NFS4ERR_WRONG_CRED:
 177                 return -EPERM;
 178         case -NFS4ERR_BADOWNER:
 179         case -NFS4ERR_BADNAME:
 180                 return -EINVAL;
 181         case -NFS4ERR_SHARE_DENIED:
 182                 return -EACCES;
 183         case -NFS4ERR_MINOR_VERS_MISMATCH:
 184                 return -EPROTONOSUPPORT;
 185         case -NFS4ERR_FILE_OPEN:
 186                 return -EBUSY;
 187         case -NFS4ERR_NOT_SAME:
 188                 return -ENOTSYNC;
 189         default:
 190                 dprintk("%s could not handle NFSv4 error %d\n",
 191                                 __func__, -err);
 192                 break;
 193         }
 194         return -EIO;
 195 }
 196
 197 /*
 198  * This is our standard bitmap for GETATTR requests.
 199  */
 200 const u32 nfs4_fattr_bitmap[3] = {
 201         FATTR4_WORD0_TYPE
 202         | FATTR4_WORD0_CHANGE
 203         | FATTR4_WORD0_SIZE
 204         | FATTR4_WORD0_FSID
 205         | FATTR4_WORD0_FILEID,
 206         FATTR4_WORD1_MODE
 207         | FATTR4_WORD1_NUMLINKS
 208         | FATTR4_WORD1_OWNER
 209         | FATTR4_WORD1_OWNER_GROUP
 210         | FATTR4_WORD1_RAWDEV
 211         | FATTR4_WORD1_SPACE_USED
 212         | FATTR4_WORD1_TIME_ACCESS
 213         | FATTR4_WORD1_TIME_METADATA
 214         | FATTR4_WORD1_TIME_MODIFY
 215         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 217         FATTR4_WORD2_SECURITY_LABEL
 218 #endif
 219 };
 220
 221 static const u32 nfs4_pnfs_open_bitmap[3] = {
 222         FATTR4_WORD0_TYPE
 223         | FATTR4_WORD0_CHANGE
 224         | FATTR4_WORD0_SIZE
 225         | FATTR4_WORD0_FSID
 226         | FATTR4_WORD0_FILEID,
 227         FATTR4_WORD1_MODE
 228         | FATTR4_WORD1_NUMLINKS
 229         | FATTR4_WORD1_OWNER
 230         | FATTR4_WORD1_OWNER_GROUP
 231         | FATTR4_WORD1_RAWDEV
 232         | FATTR4_WORD1_SPACE_USED
 233         | FATTR4_WORD1_TIME_ACCESS
 234         | FATTR4_WORD1_TIME_METADATA
 235         | FATTR4_WORD1_TIME_MODIFY,
 236         FATTR4_WORD2_MDSTHRESHOLD
 237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 238         | FATTR4_WORD2_SECURITY_LABEL
 239 #endif
 240 };
 241
 242 static const u32 nfs4_open_noattr_bitmap[3] = {
 243         FATTR4_WORD0_TYPE
 244         | FATTR4_WORD0_FILEID,
 245 };
 246
 247 const u32 nfs4_statfs_bitmap[3] = {
 248         FATTR4_WORD0_FILES_AVAIL
 249         | FATTR4_WORD0_FILES_FREE
 250         | FATTR4_WORD0_FILES_TOTAL,
 251         FATTR4_WORD1_SPACE_AVAIL
 252         | FATTR4_WORD1_SPACE_FREE
 253         | FATTR4_WORD1_SPACE_TOTAL
 254 };
 255
 256 const u32 nfs4_pathconf_bitmap[3] = {
 257         FATTR4_WORD0_MAXLINK
 258         | FATTR4_WORD0_MAXNAME,
 259         0
 260 };
 261
 262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 263                         | FATTR4_WORD0_MAXREAD
 264                         | FATTR4_WORD0_MAXWRITE
 265                         | FATTR4_WORD0_LEASE_TIME,
 266                         FATTR4_WORD1_TIME_DELTA
 267                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 268                         FATTR4_WORD2_LAYOUT_BLKSIZE
 269                         | FATTR4_WORD2_CLONE_BLKSIZE
 270                         | FATTR4_WORD2_CHANGE_ATTR_TYPE
 271                         | FATTR4_WORD2_XATTR_SUPPORT
 272 };
 273
 274 const u32 nfs4_fs_locations_bitmap[3] = {
 275         FATTR4_WORD0_CHANGE
 276         | FATTR4_WORD0_SIZE
 277         | FATTR4_WORD0_FSID
 278         | FATTR4_WORD0_FILEID
 279         | FATTR4_WORD0_FS_LOCATIONS,
 280         FATTR4_WORD1_OWNER
 281         | FATTR4_WORD1_OWNER_GROUP
 282         | FATTR4_WORD1_RAWDEV
 283         | FATTR4_WORD1_SPACE_USED
 284         | FATTR4_WORD1_TIME_ACCESS
 285         | FATTR4_WORD1_TIME_METADATA
 286         | FATTR4_WORD1_TIME_MODIFY
 287         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 288 };
 289
 290 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 291                                     struct inode *inode, unsigned long flags)
 292 {
 293         unsigned long cache_validity;
 294
 295         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 296         if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
 297                 return;
 298
 299         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
 300
 301         /* Remove the attributes over which we have full control */
 302         dst[1] &= ~FATTR4_WORD1_RAWDEV;
 303         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 304                 dst[0] &= ~FATTR4_WORD0_SIZE;
 305
 306         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 307                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 308
 309         if (!(cache_validity & NFS_INO_INVALID_MODE))
 310                 dst[1] &= ~FATTR4_WORD1_MODE;
 311         if (!(cache_validity & NFS_INO_INVALID_OTHER))
 312                 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
 313 }
 314
 315 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 316                 struct nfs4_readdir_arg *readdir)
 317 {
 318         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 319         __be32 *start, *p;
 320
 321         if (cookie > 2) {
 322                 readdir->cookie = cookie;
 323                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 324                 return;
 325         }
 326
 327         readdir->cookie = 0;
 328         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 329         if (cookie == 2)
 330                 return;
 331
 332         /*
 333          * NFSv4 servers do not return entries for '.' and '..'
 334          * Therefore, we fake these entries here.  We let '.'
 335          * have cookie 0 and '..' have cookie 1.  Note that
 336          * when talking to the server, we always send cookie 0
 337          * instead of 1 or 2.
 338          */
 339         start = p = kmap_atomic(*readdir->pages);
 340
 341         if (cookie == 0) {
 342                 *p++ = xdr_one;                                  /* next */
 343                 *p++ = xdr_zero;                   /* cookie, first word */
 344                 *p++ = xdr_one;                   /* cookie, second word */
 345                 *p++ = xdr_one;                             /* entry len */
 346                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 347                 p++;
 348                 *p++ = xdr_one;                         /* bitmap length */
 349                 *p++ = htonl(attrs);                           /* bitmap */
 350                 *p++ = htonl(12);             /* attribute buffer length */
 351                 *p++ = htonl(NF4DIR);
 352                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 353         }
 354
 355         *p++ = xdr_one;                                  /* next */
 356         *p++ = xdr_zero;                   /* cookie, first word */
 357         *p++ = xdr_two;                   /* cookie, second word */
 358         *p++ = xdr_two;                             /* entry len */
 359         memcpy(p, "..\0\0", 4);                         /* entry */
 360         p++;
 361         *p++ = xdr_one;                         /* bitmap length */
 362         *p++ = htonl(attrs);                           /* bitmap */
 363         *p++ = htonl(12);             /* attribute buffer length */
 364         *p++ = htonl(NF4DIR);
 365         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 366
 367         readdir->pgbase = (char *)p - (char *)start;
 368         readdir->count -= readdir->pgbase;
 369         kunmap_atomic(start);
 370 }
 371
 372 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
 373 {
 374         if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
 375                 fattr->pre_change_attr = version;
 376                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
 377         }
 378 }
 379
 380 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 381                 nfs4_stateid *stateid,
 382                 const struct cred *cred)
 383 {
 384         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 385
 386         ops->test_and_free_expired(server, stateid, cred);
 387 }
 388
 389 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 390                 nfs4_stateid *stateid,
 391                 const struct cred *cred)
 392 {
 393         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 394         nfs4_test_and_free_stateid(server, stateid, cred);
 395 }
 396
 397 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 398                 const nfs4_stateid *stateid,
 399                 const struct cred *cred)
 400 {
 401         nfs4_stateid tmp;
 402
 403         nfs4_stateid_copy(&tmp, stateid);
 404         __nfs4_free_revoked_stateid(server, &tmp, cred);
 405 }
 406
 407 static long nfs4_update_delay(long *timeout)
 408 {
 409         long ret;
 410         if (!timeout)
 411                 return NFS4_POLL_RETRY_MAX;
 412         if (*timeout <= 0)
 413                 *timeout = NFS4_POLL_RETRY_MIN;
 414         if (*timeout > NFS4_POLL_RETRY_MAX)
 415                 *timeout = NFS4_POLL_RETRY_MAX;
 416         ret = *timeout;
 417         *timeout <<= 1;
 418         return ret;
 419 }
 420
 421 static int nfs4_delay_killable(long *timeout)
 422 {
 423         might_sleep();
 424
 425         __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
 426         schedule_timeout(nfs4_update_delay(timeout));
 427         if (!__fatal_signal_pending(current))
 428                 return 0;
 429         return -EINTR;
 430 }
 431
 432 static int nfs4_delay_interruptible(long *timeout)
 433 {
 434         might_sleep();
 435
 436         __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
 437         schedule_timeout(nfs4_update_delay(timeout));
 438         if (!signal_pending(current))
 439                 return 0;
 440         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 441 }
 442
 443 static int nfs4_delay(long *timeout, bool interruptible)
 444 {
 445         if (interruptible)
 446                 return nfs4_delay_interruptible(timeout);
 447         return nfs4_delay_killable(timeout);
 448 }
 449
 450 static const nfs4_stateid *
 451 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 452 {
 453         if (!stateid)
 454                 return NULL;
 455         switch (stateid->type) {
 456         case NFS4_OPEN_STATEID_TYPE:
 457         case NFS4_LOCK_STATEID_TYPE:
 458         case NFS4_DELEGATION_STATEID_TYPE:
 459                 return stateid;
 460         default:
 461                 break;
 462         }
 463         return NULL;
 464 }
 465
 466 /* This is the error handling routine for processes that are allowed
 467  * to sleep.
 468  */
 469 static int nfs4_do_handle_exception(struct nfs_server *server,
 470                 int errorcode, struct nfs4_exception *exception)
 471 {
 472         struct nfs_client *clp = server->nfs_client;
 473         struct nfs4_state *state = exception->state;
 474         const nfs4_stateid *stateid;
 475         struct inode *inode = exception->inode;
 476         int ret = errorcode;
 477
 478         exception->delay = 0;
 479         exception->recovering = 0;
 480         exception->retry = 0;
 481
 482         stateid = nfs4_recoverable_stateid(exception->stateid);
 483         if (stateid == NULL && state != NULL)
 484                 stateid = nfs4_recoverable_stateid(&state->stateid);
 485
 486         switch(errorcode) {
 487                 case 0:
 488                         return 0;
 489                 case -NFS4ERR_BADHANDLE:
 490                 case -ESTALE:
 491                         if (inode != NULL && S_ISREG(inode->i_mode))
 492                                 pnfs_destroy_layout(NFS_I(inode));
 493                         break;
 494                 case -NFS4ERR_DELEG_REVOKED:
 495                 case -NFS4ERR_ADMIN_REVOKED:
 496                 case -NFS4ERR_EXPIRED:
 497                 case -NFS4ERR_BAD_STATEID:
 498                 case -NFS4ERR_PARTNER_NO_AUTH:
 499                         if (inode != NULL && stateid != NULL) {
 500                                 nfs_inode_find_state_and_recover(inode,
 501                                                 stateid);
 502                                 goto wait_on_recovery;
 503                         }
 504                         fallthrough;
 505                 case -NFS4ERR_OPENMODE:
 506                         if (inode) {
 507                                 int err;
 508
 509                                 err = nfs_async_inode_return_delegation(inode,
 510                                                 stateid);
 511                                 if (err == 0)
 512                                         goto wait_on_recovery;
 513                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 514                                         exception->retry = 1;
 515                                         break;
 516                                 }
 517                         }
 518                         if (state == NULL)
 519                                 break;
 520                         ret = nfs4_schedule_stateid_recovery(server, state);
 521                         if (ret < 0)
 522                                 break;
 523                         goto wait_on_recovery;
 524                 case -NFS4ERR_STALE_STATEID:
 525                 case -NFS4ERR_STALE_CLIENTID:
 526                         nfs4_schedule_lease_recovery(clp);
 527                         goto wait_on_recovery;
 528                 case -NFS4ERR_MOVED:
 529                         ret = nfs4_schedule_migration_recovery(server);
 530                         if (ret < 0)
 531                                 break;
 532                         goto wait_on_recovery;
 533                 case -NFS4ERR_LEASE_MOVED:
 534                         nfs4_schedule_lease_moved_recovery(clp);
 535                         goto wait_on_recovery;
 536 #if defined(CONFIG_NFS_V4_1)
 537                 case -NFS4ERR_BADSESSION:
 538                 case -NFS4ERR_BADSLOT:
 539                 case -NFS4ERR_BAD_HIGH_SLOT:
 540                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 541                 case -NFS4ERR_DEADSESSION:
 542                 case -NFS4ERR_SEQ_FALSE_RETRY:
 543                 case -NFS4ERR_SEQ_MISORDERED:
 544                         /* Handled in nfs41_sequence_process() */
 545                         goto wait_on_recovery;
 546 #endif /* defined(CONFIG_NFS_V4_1) */
 547                 case -NFS4ERR_FILE_OPEN:
 548                         if (exception->timeout > HZ) {
 549                                 /* We have retried a decent amount, time to
 550                                  * fail
 551                                  */
 552                                 ret = -EBUSY;
 553                                 break;
 554                         }
 555                         fallthrough;
 556                 case -NFS4ERR_DELAY:
 557                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 558                         fallthrough;
 559                 case -NFS4ERR_GRACE:
 560                 case -NFS4ERR_LAYOUTTRYLATER:
 561                 case -NFS4ERR_RECALLCONFLICT:
 562                 case -NFS4ERR_RETURNCONFLICT:
 563                         exception->delay = 1;
 564                         return 0;
 565
 566                 case -NFS4ERR_RETRY_UNCACHED_REP:
 567                 case -NFS4ERR_OLD_STATEID:
 568                         exception->retry = 1;
 569                         break;
 570                 case -NFS4ERR_BADOWNER:
 571                         /* The following works around a Linux server bug! */
 572                 case -NFS4ERR_BADNAME:
 573                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 574                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 575                                 exception->retry = 1;
 576                                 printk(KERN_WARNING "NFS: v4 server %s "
 577                                                 "does not accept raw "
 578                                                 "uid/gids. "
 579                                                 "Reenabling the idmapper.\n",
 580                                                 server->nfs_client->cl_hostname);
 581                         }
 582         }
 583         /* We failed to handle the error */
 584         return nfs4_map_errors(ret);
 585 wait_on_recovery:
 586         exception->recovering = 1;
 587         return 0;
 588 }
 589
 590 /*
 591  * Track the number of NFS4ERR_DELAY related retransmissions and return
 592  * EAGAIN if the 'softerr' mount option is set, and we've exceeded the limit
 593  * set by 'nfs_delay_retrans'.
 594  */
 595 static int nfs4_exception_should_retrans(const struct nfs_server *server,
 596                                          struct nfs4_exception *exception)
 597 {
 598         if (server->flags & NFS_MOUNT_SOFTERR && nfs_delay_retrans >= 0) {
 599                 if (exception->retrans++ >= (unsigned short)nfs_delay_retrans)
 600                         return -EAGAIN;
 601         }
 602         return 0;
 603 }
 604
 605 /* This is the error handling routine for processes that are allowed
 606  * to sleep.
 607  */
 608 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 609 {
 610         struct nfs_client *clp = server->nfs_client;
 611         int ret;
 612
 613         ret = nfs4_do_handle_exception(server, errorcode, exception);
 614         if (exception->delay) {
 615                 int ret2 = nfs4_exception_should_retrans(server, exception);
 616                 if (ret2 < 0) {
 617                         exception->retry = 0;
 618                         return ret2;
 619                 }
 620                 ret = nfs4_delay(&exception->timeout,
 621                                 exception->interruptible);
 622                 goto out_retry;
 623         }
 624         if (exception->recovering) {
 625                 if (exception->task_is_privileged)
 626                         return -EDEADLOCK;
 627                 ret = nfs4_wait_clnt_recover(clp);
 628                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 629                         return -EIO;
 630                 goto out_retry;
 631         }
 632         return ret;
 633 out_retry:
 634         if (ret == 0)
 635                 exception->retry = 1;
 636         return ret;
 637 }
 638
 639 static int
 640 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 641                 int errorcode, struct nfs4_exception *exception)
 642 {
 643         struct nfs_client *clp = server->nfs_client;
 644         int ret;
 645
 646         ret = nfs4_do_handle_exception(server, errorcode, exception);
 647         if (exception->delay) {
 648                 int ret2 = nfs4_exception_should_retrans(server, exception);
 649                 if (ret2 < 0) {
 650                         exception->retry = 0;
 651                         return ret2;
 652                 }
 653                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 654                 goto out_retry;
 655         }
 656         if (exception->recovering) {
 657                 if (exception->task_is_privileged)
 658                         return -EDEADLOCK;
 659                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 660                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 661                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 662                 goto out_retry;
 663         }
 664         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 665                 ret = -EIO;
 666         return ret;
 667 out_retry:
 668         if (ret == 0) {
 669                 exception->retry = 1;
 670                 /*
 671                  * For NFS4ERR_MOVED, the client transport will need to
 672                  * be recomputed after migration recovery has completed.
 673                  */
 674                 if (errorcode == -NFS4ERR_MOVED)
 675                         rpc_task_release_transport(task);
 676         }
 677         return ret;
 678 }
 679
 680 int
 681 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 682                         struct nfs4_state *state, long *timeout)
 683 {
 684         struct nfs4_exception exception = {
 685                 .state = state,
 686         };
 687
 688         if (task->tk_status >= 0)
 689                 return 0;
 690         if (timeout)
 691                 exception.timeout = *timeout;
 692         task->tk_status = nfs4_async_handle_exception(task, server,
 693                         task->tk_status,
 694                         &exception);
 695         if (exception.delay && timeout)
 696                 *timeout = exception.timeout;
 697         if (exception.retry)
 698                 return -EAGAIN;
 699         return 0;
 700 }
 701
 702 /*
 703  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 704  * or 'false' otherwise.
 705  */
 706 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 707 {
 708         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 709         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 710 }
 711
 712 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 713 {
 714         spin_lock(&clp->cl_lock);
 715         if (time_before(clp->cl_last_renewal,timestamp))
 716                 clp->cl_last_renewal = timestamp;
 717         spin_unlock(&clp->cl_lock);
 718 }
 719
 720 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 721 {
 722         struct nfs_client *clp = server->nfs_client;
 723
 724         if (!nfs4_has_session(clp))
 725                 do_renew_lease(clp, timestamp);
 726 }
 727
 728 struct nfs4_call_sync_data {
 729         const struct nfs_server *seq_server;
 730         struct nfs4_sequence_args *seq_args;
 731         struct nfs4_sequence_res *seq_res;
 732 };
 733
 734 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 735                         struct nfs4_sequence_res *res, int cache_reply,
 736                         int privileged)
 737 {
 738         args->sa_slot = NULL;
 739         args->sa_cache_this = cache_reply;
 740         args->sa_privileged = privileged;
 741
 742         res->sr_slot = NULL;
 743 }
 744
 745 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 746 {
 747         struct nfs4_slot *slot = res->sr_slot;
 748         struct nfs4_slot_table *tbl;
 749
 750         tbl = slot->table;
 751         spin_lock(&tbl->slot_tbl_lock);
 752         if (!nfs41_wake_and_assign_slot(tbl, slot))
 753                 nfs4_free_slot(tbl, slot);
 754         spin_unlock(&tbl->slot_tbl_lock);
 755
 756         res->sr_slot = NULL;
 757 }
 758
 759 static int nfs40_sequence_done(struct rpc_task *task,
 760                                struct nfs4_sequence_res *res)
 761 {
 762         if (res->sr_slot != NULL)
 763                 nfs40_sequence_free_slot(res);
 764         return 1;
 765 }
 766
 767 #if defined(CONFIG_NFS_V4_1)
 768
 769 static void nfs41_release_slot(struct nfs4_slot *slot)
 770 {
 771         struct nfs4_session *session;
 772         struct nfs4_slot_table *tbl;
 773         bool send_new_highest_used_slotid = false;
 774
 775         if (!slot)
 776                 return;
 777         tbl = slot->table;
 778         session = tbl->session;
 779
 780         /* Bump the slot sequence number */
 781         if (slot->seq_done)
 782                 slot->seq_nr++;
 783         slot->seq_done = 0;
 784
 785         spin_lock(&tbl->slot_tbl_lock);
 786         /* Be nice to the server: try to ensure that the last transmitted
 787          * value for highest_user_slotid <= target_highest_slotid
 788          */
 789         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 790                 send_new_highest_used_slotid = true;
 791
 792         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 793                 send_new_highest_used_slotid = false;
 794                 goto out_unlock;
 795         }
 796         nfs4_free_slot(tbl, slot);
 797
 798         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 799                 send_new_highest_used_slotid = false;
 800 out_unlock:
 801         spin_unlock(&tbl->slot_tbl_lock);
 802         if (send_new_highest_used_slotid)
 803                 nfs41_notify_server(session->clp);
 804         if (waitqueue_active(&tbl->slot_waitq))
 805                 wake_up_all(&tbl->slot_waitq);
 806 }
 807
 808 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 809 {
 810         nfs41_release_slot(res->sr_slot);
 811         res->sr_slot = NULL;
 812 }
 813
 814 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 815                 u32 seqnr)
 816 {
 817         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 818                 slot->seq_nr_highest_sent = seqnr;
 819 }
 820 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
 821 {
 822         nfs4_slot_sequence_record_sent(slot, seqnr);
 823         slot->seq_nr_last_acked = seqnr;
 824 }
 825
 826 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
 827                                 struct nfs4_slot *slot)
 828 {
 829         struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
 830         if (!IS_ERR(task))
 831                 rpc_put_task_async(task);
 832 }
 833
 834 static int nfs41_sequence_process(struct rpc_task *task,
 835                 struct nfs4_sequence_res *res)
 836 {
 837         struct nfs4_session *session;
 838         struct nfs4_slot *slot = res->sr_slot;
 839         struct nfs_client *clp;
 840         int status;
 841         int ret = 1;
 842
 843         if (slot == NULL)
 844                 goto out_noaction;
 845         /* don't increment the sequence number if the task wasn't sent */
 846         if (!RPC_WAS_SENT(task) || slot->seq_done)
 847                 goto out;
 848
 849         session = slot->table->session;
 850         clp = session->clp;
 851
 852         trace_nfs4_sequence_done(session, res);
 853
 854         status = res->sr_status;
 855         if (task->tk_status == -NFS4ERR_DEADSESSION)
 856                 status = -NFS4ERR_DEADSESSION;
 857
 858         /* Check the SEQUENCE operation status */
 859         switch (status) {
 860         case 0:
 861                 /* Mark this sequence number as having been acked */
 862                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 863                 /* Update the slot's sequence and clientid lease timer */
 864                 slot->seq_done = 1;
 865                 do_renew_lease(clp, res->sr_timestamp);
 866                 /* Check sequence flags */
 867                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 868                                 !!slot->privileged);
 869                 nfs41_update_target_slotid(slot->table, slot, res);
 870                 break;
 871         case 1:
 872                 /*
 873                  * sr_status remains 1 if an RPC level error occurred.
 874                  * The server may or may not have processed the sequence
 875                  * operation..
 876                  */
 877                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 878                 slot->seq_done = 1;
 879                 goto out;
 880         case -NFS4ERR_DELAY:
 881                 /* The server detected a resend of the RPC call and
 882                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 883                  * of RFC5661.
 884                  */
 885                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 886                         __func__,
 887                         slot->slot_nr,
 888                         slot->seq_nr);
 889                 goto out_retry;
 890         case -NFS4ERR_RETRY_UNCACHED_REP:
 891         case -NFS4ERR_SEQ_FALSE_RETRY:
 892                 /*
 893                  * The server thinks we tried to replay a request.
 894                  * Retry the call after bumping the sequence ID.
 895                  */
 896                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 897                 goto retry_new_seq;
 898         case -NFS4ERR_BADSLOT:
 899                 /*
 900                  * The slot id we used was probably retired. Try again
 901                  * using a different slot id.
 902                  */
 903                 if (slot->slot_nr < slot->table->target_highest_slotid)
 904                         goto session_recover;
 905                 goto retry_nowait;
 906         case -NFS4ERR_SEQ_MISORDERED:
 907                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 908                 /*
 909                  * Were one or more calls using this slot interrupted?
 910                  * If the server never received the request, then our
 911                  * transmitted slot sequence number may be too high. However,
 912                  * if the server did receive the request then it might
 913                  * accidentally give us a reply with a mismatched operation.
 914                  * We can sort this out by sending a lone sequence operation
 915                  * to the server on the same slot.
 916                  */
 917                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 918                         slot->seq_nr--;
 919                         if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
 920                                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
 921                                 res->sr_slot = NULL;
 922                         }
 923                         goto retry_nowait;
 924                 }
 925                 /*
 926                  * RFC5661:
 927                  * A retry might be sent while the original request is
 928                  * still in progress on the replier. The replier SHOULD
 929                  * deal with the issue by returning NFS4ERR_DELAY as the
 930                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 931                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 932                  *
 933                  * Restart the search after a delay.
 934                  */
 935                 slot->seq_nr = slot->seq_nr_highest_sent;
 936                 goto out_retry;
 937         case -NFS4ERR_BADSESSION:
 938         case -NFS4ERR_DEADSESSION:
 939         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 940                 goto session_recover;
 941         default:
 942                 /* Just update the slot sequence no. */
 943                 slot->seq_done = 1;
 944         }
 945 out:
 946         /* The session may be reset by one of the error handlers. */
 947         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 948 out_noaction:
 949         return ret;
 950 session_recover:
 951         set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
 952         nfs4_schedule_session_recovery(session, status);
 953         dprintk("%s ERROR: %d Reset session\n", __func__, status);
 954         nfs41_sequence_free_slot(res);
 955         goto out;
 956 retry_new_seq:
 957         ++slot->seq_nr;
 958 retry_nowait:
 959         if (rpc_restart_call_prepare(task)) {
 960                 nfs41_sequence_free_slot(res);
 961                 task->tk_status = 0;
 962                 ret = 0;
 963         }
 964         goto out;
 965 out_retry:
 966         if (!rpc_restart_call(task))
 967                 goto out;
 968         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 969         return 0;
 970 }
 971
 972 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 973 {
 974         if (!nfs41_sequence_process(task, res))
 975                 return 0;
 976         if (res->sr_slot != NULL)
 977                 nfs41_sequence_free_slot(res);
 978         return 1;
 979
 980 }
 981 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 982
 983 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 984 {
 985         if (res->sr_slot == NULL)
 986                 return 1;
 987         if (res->sr_slot->table->session != NULL)
 988                 return nfs41_sequence_process(task, res);
 989         return nfs40_sequence_done(task, res);
 990 }
 991
 992 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 993 {
 994         if (res->sr_slot != NULL) {
 995                 if (res->sr_slot->table->session != NULL)
 996                         nfs41_sequence_free_slot(res);
 997                 else
 998                         nfs40_sequence_free_slot(res);
 999         }
1000 }
1001
1002 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
1003 {
1004         if (res->sr_slot == NULL)
1005                 return 1;
1006         if (!res->sr_slot->table->session)
1007                 return nfs40_sequence_done(task, res);
1008         return nfs41_sequence_done(task, res);
1009 }
1010 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1011
1012 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
1013 {
1014         struct nfs4_call_sync_data *data = calldata;
1015
1016         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
1017
1018         nfs4_setup_sequence(data->seq_server->nfs_client,
1019                             data->seq_args, data->seq_res, task);
1020 }
1021
1022 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
1023 {
1024         struct nfs4_call_sync_data *data = calldata;
1025
1026         nfs41_sequence_done(task, data->seq_res);
1027 }
1028
1029 static const struct rpc_call_ops nfs41_call_sync_ops = {
1030         .rpc_call_prepare = nfs41_call_sync_prepare,
1031         .rpc_call_done = nfs41_call_sync_done,
1032 };
1033
1034 #else   /* !CONFIG_NFS_V4_1 */
1035
1036 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1037 {
1038         return nfs40_sequence_done(task, res);
1039 }
1040
1041 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1042 {
1043         if (res->sr_slot != NULL)
1044                 nfs40_sequence_free_slot(res);
1045 }
1046
1047 int nfs4_sequence_done(struct rpc_task *task,
1048                        struct nfs4_sequence_res *res)
1049 {
1050         return nfs40_sequence_done(task, res);
1051 }
1052 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1053
1054 #endif  /* !CONFIG_NFS_V4_1 */
1055
1056 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1057 {
1058         res->sr_timestamp = jiffies;
1059         res->sr_status_flags = 0;
1060         res->sr_status = 1;
1061 }
1062
1063 static
1064 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1065                 struct nfs4_sequence_res *res,
1066                 struct nfs4_slot *slot)
1067 {
1068         if (!slot)
1069                 return;
1070         slot->privileged = args->sa_privileged ? 1 : 0;
1071         args->sa_slot = slot;
1072
1073         res->sr_slot = slot;
1074 }
1075
1076 int nfs4_setup_sequence(struct nfs_client *client,
1077                         struct nfs4_sequence_args *args,
1078                         struct nfs4_sequence_res *res,
1079                         struct rpc_task *task)
1080 {
1081         struct nfs4_session *session = nfs4_get_session(client);
1082         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1083         struct nfs4_slot *slot;
1084
1085         /* slot already allocated? */
1086         if (res->sr_slot != NULL)
1087                 goto out_start;
1088
1089         if (session)
1090                 tbl = &session->fc_slot_table;
1091
1092         spin_lock(&tbl->slot_tbl_lock);
1093         /* The state manager will wait until the slot table is empty */
1094         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1095                 goto out_sleep;
1096
1097         slot = nfs4_alloc_slot(tbl);
1098         if (IS_ERR(slot)) {
1099                 if (slot == ERR_PTR(-ENOMEM))
1100                         goto out_sleep_timeout;
1101                 goto out_sleep;
1102         }
1103         spin_unlock(&tbl->slot_tbl_lock);
1104
1105         nfs4_sequence_attach_slot(args, res, slot);
1106
1107         trace_nfs4_setup_sequence(session, args);
1108 out_start:
1109         nfs41_sequence_res_init(res);
1110         rpc_call_start(task);
1111         return 0;
1112 out_sleep_timeout:
1113         /* Try again in 1/4 second */
1114         if (args->sa_privileged)
1115                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1116                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1117         else
1118                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1119                                 NULL, jiffies + (HZ >> 2));
1120         spin_unlock(&tbl->slot_tbl_lock);
1121         return -EAGAIN;
1122 out_sleep:
1123         if (args->sa_privileged)
1124                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1125                                 RPC_PRIORITY_PRIVILEGED);
1126         else
1127                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1128         spin_unlock(&tbl->slot_tbl_lock);
1129         return -EAGAIN;
1130 }
1131 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1132
1133 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1134 {
1135         struct nfs4_call_sync_data *data = calldata;
1136         nfs4_setup_sequence(data->seq_server->nfs_client,
1137                                 data->seq_args, data->seq_res, task);
1138 }
1139
1140 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1141 {
1142         struct nfs4_call_sync_data *data = calldata;
1143         nfs4_sequence_done(task, data->seq_res);
1144 }
1145
1146 static const struct rpc_call_ops nfs40_call_sync_ops = {
1147         .rpc_call_prepare = nfs40_call_sync_prepare,
1148         .rpc_call_done = nfs40_call_sync_done,
1149 };
1150
1151 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1152 {
1153         int ret;
1154         struct rpc_task *task;
1155
1156         task = rpc_run_task(task_setup);
1157         if (IS_ERR(task))
1158                 return PTR_ERR(task);
1159
1160         ret = task->tk_status;
1161         rpc_put_task(task);
1162         return ret;
1163 }
1164
1165 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1166                              struct nfs_server *server,
1167                              struct rpc_message *msg,
1168                              struct nfs4_sequence_args *args,
1169                              struct nfs4_sequence_res *res,
1170                              unsigned short task_flags)
1171 {
1172         struct nfs_client *clp = server->nfs_client;
1173         struct nfs4_call_sync_data data = {
1174                 .seq_server = server,
1175                 .seq_args = args,
1176                 .seq_res = res,
1177         };
1178         struct rpc_task_setup task_setup = {
1179                 .rpc_client = clnt,
1180                 .rpc_message = msg,
1181                 .callback_ops = clp->cl_mvops->call_sync_ops,
1182                 .callback_data = &data,
1183                 .flags = task_flags,
1184         };
1185
1186         return nfs4_call_sync_custom(&task_setup);
1187 }
1188
1189 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1190                                    struct nfs_server *server,
1191                                    struct rpc_message *msg,
1192                                    struct nfs4_sequence_args *args,
1193                                    struct nfs4_sequence_res *res)
1194 {
1195         unsigned short task_flags = 0;
1196
1197         if (server->caps & NFS_CAP_MOVEABLE)
1198                 task_flags = RPC_TASK_MOVEABLE;
1199         return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1200 }
1201
1202
1203 int nfs4_call_sync(struct rpc_clnt *clnt,
1204                    struct nfs_server *server,
1205                    struct rpc_message *msg,
1206                    struct nfs4_sequence_args *args,
1207                    struct nfs4_sequence_res *res,
1208                    int cache_reply)
1209 {
1210         nfs4_init_sequence(args, res, cache_reply, 0);
1211         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1212 }
1213
1214 static void
1215 nfs4_inc_nlink_locked(struct inode *inode)
1216 {
1217         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1218                                              NFS_INO_INVALID_CTIME |
1219                                              NFS_INO_INVALID_NLINK);
1220         inc_nlink(inode);
1221 }
1222
1223 static void
1224 nfs4_inc_nlink(struct inode *inode)
1225 {
1226         spin_lock(&inode->i_lock);
1227         nfs4_inc_nlink_locked(inode);
1228         spin_unlock(&inode->i_lock);
1229 }
1230
1231 static void
1232 nfs4_dec_nlink_locked(struct inode *inode)
1233 {
1234         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1235                                              NFS_INO_INVALID_CTIME |
1236                                              NFS_INO_INVALID_NLINK);
1237         drop_nlink(inode);
1238 }
1239
1240 static void
1241 nfs4_update_changeattr_locked(struct inode *inode,
1242                 struct nfs4_change_info *cinfo,
1243                 unsigned long timestamp, unsigned long cache_validity)
1244 {
1245         struct nfs_inode *nfsi = NFS_I(inode);
1246         u64 change_attr = inode_peek_iversion_raw(inode);
1247
1248         cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1249         if (S_ISDIR(inode->i_mode))
1250                 cache_validity |= NFS_INO_INVALID_DATA;
1251
1252         switch (NFS_SERVER(inode)->change_attr_type) {
1253         case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1254                 if (cinfo->after == change_attr)
1255                         goto out;
1256                 break;
1257         default:
1258                 if ((s64)(change_attr - cinfo->after) >= 0)
1259                         goto out;
1260         }
1261
1262         inode_set_iversion_raw(inode, cinfo->after);
1263         if (!cinfo->atomic || cinfo->before != change_attr) {
1264                 if (S_ISDIR(inode->i_mode))
1265                         nfs_force_lookup_revalidate(inode);
1266
1267                 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1268                         cache_validity |=
1269                                 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1270                                 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1271                                 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1272                                 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1273                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1274         }
1275         nfsi->attrtimeo_timestamp = jiffies;
1276         nfsi->read_cache_jiffies = timestamp;
1277         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1278         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1279 out:
1280         nfs_set_cache_invalid(inode, cache_validity);
1281 }
1282
1283 void
1284 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1285                 unsigned long timestamp, unsigned long cache_validity)
1286 {
1287         spin_lock(&dir->i_lock);
1288         nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1289         spin_unlock(&dir->i_lock);
1290 }
1291
1292 struct nfs4_open_createattrs {
1293         struct nfs4_label *label;
1294         struct iattr *sattr;
1295         const __u32 verf[2];
1296 };
1297
1298 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1299                 int err, struct nfs4_exception *exception)
1300 {
1301         if (err != -EINVAL)
1302                 return false;
1303         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1304                 return false;
1305         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1306         exception->retry = 1;
1307         return true;
1308 }
1309
1310 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1311 {
1312          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1313 }
1314
1315 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1316 {
1317         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1318
1319         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1320 }
1321
1322 static u32
1323 nfs4_map_atomic_open_share(struct nfs_server *server,
1324                 fmode_t fmode, int openflags)
1325 {
1326         u32 res = 0;
1327
1328         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1329         case FMODE_READ:
1330                 res = NFS4_SHARE_ACCESS_READ;
1331                 break;
1332         case FMODE_WRITE:
1333                 res = NFS4_SHARE_ACCESS_WRITE;
1334                 break;
1335         case FMODE_READ|FMODE_WRITE:
1336                 res = NFS4_SHARE_ACCESS_BOTH;
1337         }
1338         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1339                 goto out;
1340         /* Want no delegation if we're using O_DIRECT */
1341         if (openflags & O_DIRECT)
1342                 res |= NFS4_SHARE_WANT_NO_DELEG;
1343 out:
1344         return res;
1345 }
1346
1347 static enum open_claim_type4
1348 nfs4_map_atomic_open_claim(struct nfs_server *server,
1349                 enum open_claim_type4 claim)
1350 {
1351         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1352                 return claim;
1353         switch (claim) {
1354         default:
1355                 return claim;
1356         case NFS4_OPEN_CLAIM_FH:
1357                 return NFS4_OPEN_CLAIM_NULL;
1358         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1359                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1360         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1361                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1362         }
1363 }
1364
1365 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1366 {
1367         p->o_res.f_attr = &p->f_attr;
1368         p->o_res.seqid = p->o_arg.seqid;
1369         p->c_res.seqid = p->c_arg.seqid;
1370         p->o_res.server = p->o_arg.server;
1371         p->o_res.access_request = p->o_arg.access;
1372         nfs_fattr_init(&p->f_attr);
1373         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1374 }
1375
1376 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1377                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1378                 const struct nfs4_open_createattrs *c,
1379                 enum open_claim_type4 claim,
1380                 gfp_t gfp_mask)
1381 {
1382         struct dentry *parent = dget_parent(dentry);
1383         struct inode *dir = d_inode(parent);
1384         struct nfs_server *server = NFS_SERVER(dir);
1385         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1386         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1387         struct nfs4_opendata *p;
1388
1389         p = kzalloc(sizeof(*p), gfp_mask);
1390         if (p == NULL)
1391                 goto err;
1392
1393         p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1394         if (IS_ERR(p->f_attr.label))
1395                 goto err_free_p;
1396
1397         p->a_label = nfs4_label_alloc(server, gfp_mask);
1398         if (IS_ERR(p->a_label))
1399                 goto err_free_f;
1400
1401         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1402         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1403         if (IS_ERR(p->o_arg.seqid))
1404                 goto err_free_label;
1405         nfs_sb_active(dentry->d_sb);
1406         p->dentry = dget(dentry);
1407         p->dir = parent;
1408         p->owner = sp;
1409         atomic_inc(&sp->so_count);
1410         p->o_arg.open_flags = flags;
1411         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1412         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1413         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1414                         fmode, flags);
1415         if (flags & O_CREAT) {
1416                 p->o_arg.umask = current_umask();
1417                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1418                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1419                         p->o_arg.u.attrs = &p->attrs;
1420                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1421
1422                         memcpy(p->o_arg.u.verifier.data, c->verf,
1423                                         sizeof(p->o_arg.u.verifier.data));
1424                 }
1425         }
1426         /* ask server to check for all possible rights as results
1427          * are cached */
1428         switch (p->o_arg.claim) {
1429         default:
1430                 break;
1431         case NFS4_OPEN_CLAIM_NULL:
1432         case NFS4_OPEN_CLAIM_FH:
1433                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1434                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1435                                   NFS4_ACCESS_EXECUTE |
1436                                   nfs_access_xattr_mask(server);
1437         }
1438         p->o_arg.clientid = server->nfs_client->cl_clientid;
1439         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1440         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1441         p->o_arg.name = &dentry->d_name;
1442         p->o_arg.server = server;
1443         p->o_arg.bitmask = nfs4_bitmask(server, label);
1444         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1445         switch (p->o_arg.claim) {
1446         case NFS4_OPEN_CLAIM_NULL:
1447         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1448         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1449                 p->o_arg.fh = NFS_FH(dir);
1450                 break;
1451         case NFS4_OPEN_CLAIM_PREVIOUS:
1452         case NFS4_OPEN_CLAIM_FH:
1453         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1454         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1455                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1456         }
1457         p->c_arg.fh = &p->o_res.fh;
1458         p->c_arg.stateid = &p->o_res.stateid;
1459         p->c_arg.seqid = p->o_arg.seqid;
1460         nfs4_init_opendata_res(p);
1461         kref_init(&p->kref);
1462         return p;
1463
1464 err_free_label:
1465         nfs4_label_free(p->a_label);
1466 err_free_f:
1467         nfs4_label_free(p->f_attr.label);
1468 err_free_p:
1469         kfree(p);
1470 err:
1471         dput(parent);
1472         return NULL;
1473 }
1474
1475 static void nfs4_opendata_free(struct kref *kref)
1476 {
1477         struct nfs4_opendata *p = container_of(kref,
1478                         struct nfs4_opendata, kref);
1479         struct super_block *sb = p->dentry->d_sb;
1480
1481         nfs4_lgopen_release(p->lgp);
1482         nfs_free_seqid(p->o_arg.seqid);
1483         nfs4_sequence_free_slot(&p->o_res.seq_res);
1484         if (p->state != NULL)
1485                 nfs4_put_open_state(p->state);
1486         nfs4_put_state_owner(p->owner);
1487
1488         nfs4_label_free(p->a_label);
1489         nfs4_label_free(p->f_attr.label);
1490
1491         dput(p->dir);
1492         dput(p->dentry);
1493         nfs_sb_deactive(sb);
1494         nfs_fattr_free_names(&p->f_attr);
1495         kfree(p->f_attr.mdsthreshold);
1496         kfree(p);
1497 }
1498
1499 static void nfs4_opendata_put(struct nfs4_opendata *p)
1500 {
1501         if (p != NULL)
1502                 kref_put(&p->kref, nfs4_opendata_free);
1503 }
1504
1505 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1506                 fmode_t fmode)
1507 {
1508         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1509         case FMODE_READ|FMODE_WRITE:
1510                 return state->n_rdwr != 0;
1511         case FMODE_WRITE:
1512                 return state->n_wronly != 0;
1513         case FMODE_READ:
1514                 return state->n_rdonly != 0;
1515         }
1516         WARN_ON_ONCE(1);
1517         return false;
1518 }
1519
1520 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1521                 int open_mode, enum open_claim_type4 claim)
1522 {
1523         int ret = 0;
1524
1525         if (open_mode & (O_EXCL|O_TRUNC))
1526                 goto out;
1527         switch (claim) {
1528         case NFS4_OPEN_CLAIM_NULL:
1529         case NFS4_OPEN_CLAIM_FH:
1530                 goto out;
1531         default:
1532                 break;
1533         }
1534         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1535                 case FMODE_READ:
1536                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1537                                 && state->n_rdonly != 0;
1538                         break;
1539                 case FMODE_WRITE:
1540                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1541                                 && state->n_wronly != 0;
1542                         break;
1543                 case FMODE_READ|FMODE_WRITE:
1544                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1545                                 && state->n_rdwr != 0;
1546         }
1547 out:
1548         return ret;
1549 }
1550
1551 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1552                 enum open_claim_type4 claim)
1553 {
1554         if (delegation == NULL)
1555                 return 0;
1556         if ((delegation->type & fmode) != fmode)
1557                 return 0;
1558         switch (claim) {
1559         case NFS4_OPEN_CLAIM_NULL:
1560         case NFS4_OPEN_CLAIM_FH:
1561                 break;
1562         case NFS4_OPEN_CLAIM_PREVIOUS:
1563                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1564                         break;
1565                 fallthrough;
1566         default:
1567                 return 0;
1568         }
1569         nfs_mark_delegation_referenced(delegation);
1570         return 1;
1571 }
1572
1573 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1574 {
1575         switch (fmode) {
1576                 case FMODE_WRITE:
1577                         state->n_wronly++;
1578                         break;
1579                 case FMODE_READ:
1580                         state->n_rdonly++;
1581                         break;
1582                 case FMODE_READ|FMODE_WRITE:
1583                         state->n_rdwr++;
1584         }
1585         nfs4_state_set_mode_locked(state, state->state | fmode);
1586 }
1587
1588 #ifdef CONFIG_NFS_V4_1
1589 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1590 {
1591         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1592                 return true;
1593         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1594                 return true;
1595         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1596                 return true;
1597         return false;
1598 }
1599 #endif /* CONFIG_NFS_V4_1 */
1600
1601 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1602 {
1603         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1604                 wake_up_all(&state->waitq);
1605 }
1606
1607 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1608 {
1609         struct nfs_client *clp = state->owner->so_server->nfs_client;
1610         bool need_recover = false;
1611
1612         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1613                 need_recover = true;
1614         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1615                 need_recover = true;
1616         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1617                 need_recover = true;
1618         if (need_recover)
1619                 nfs4_state_mark_reclaim_nograce(clp, state);
1620 }
1621
1622 /*
1623  * Check for whether or not the caller may update the open stateid
1624  * to the value passed in by stateid.
1625  *
1626  * Note: This function relies heavily on the server implementing
1627  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1628  * correctly.
1629  * i.e. The stateid seqids have to be initialised to 1, and
1630  * are then incremented on every state transition.
1631  */
1632 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1633                 const nfs4_stateid *stateid)
1634 {
1635         if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1636                 /* The common case - we're updating to a new sequence number */
1637                 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1638                         if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1639                                 return true;
1640                         return false;
1641                 }
1642                 /* The server returned a new stateid */
1643         }
1644         /* This is the first OPEN in this generation */
1645         if (stateid->seqid == cpu_to_be32(1))
1646                 return true;
1647         return false;
1648 }
1649
1650 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1651 {
1652         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1653                 return;
1654         if (state->n_wronly)
1655                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1656         if (state->n_rdonly)
1657                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1658         if (state->n_rdwr)
1659                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1660         set_bit(NFS_OPEN_STATE, &state->flags);
1661 }
1662
1663 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1664                 nfs4_stateid *stateid, fmode_t fmode)
1665 {
1666         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1667         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1668         case FMODE_WRITE:
1669                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1670                 break;
1671         case FMODE_READ:
1672                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1673                 break;
1674         case 0:
1675                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1676                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1677                 clear_bit(NFS_OPEN_STATE, &state->flags);
1678         }
1679         if (stateid == NULL)
1680                 return;
1681         /* Handle OPEN+OPEN_DOWNGRADE races */
1682         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1683             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1684                 nfs_resync_open_stateid_locked(state);
1685                 goto out;
1686         }
1687         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1688                 nfs4_stateid_copy(&state->stateid, stateid);
1689         nfs4_stateid_copy(&state->open_stateid, stateid);
1690         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1691 out:
1692         nfs_state_log_update_open_stateid(state);
1693 }
1694
1695 static void nfs_clear_open_stateid(struct nfs4_state *state,
1696         nfs4_stateid *arg_stateid,
1697         nfs4_stateid *stateid, fmode_t fmode)
1698 {
1699         write_seqlock(&state->seqlock);
1700         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1701         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1702                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1703         write_sequnlock(&state->seqlock);
1704         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1705                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1706 }
1707
1708 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1709                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1710         __must_hold(&state->owner->so_lock)
1711         __must_hold(&state->seqlock)
1712         __must_hold(RCU)
1713
1714 {
1715         DEFINE_WAIT(wait);
1716         int status = 0;
1717         for (;;) {
1718
1719                 if (nfs_stateid_is_sequential(state, stateid))
1720                         break;
1721
1722                 if (status)
1723                         break;
1724                 /* Rely on seqids for serialisation with NFSv4.0 */
1725                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1726                         break;
1727
1728                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1729                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1730                 /*
1731                  * Ensure we process the state changes in the same order
1732                  * in which the server processed them by delaying the
1733                  * update of the stateid until we are in sequence.
1734                  */
1735                 write_sequnlock(&state->seqlock);
1736                 spin_unlock(&state->owner->so_lock);
1737                 rcu_read_unlock();
1738                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1739
1740                 if (!fatal_signal_pending(current)) {
1741                         if (schedule_timeout(5*HZ) == 0)
1742                                 status = -EAGAIN;
1743                         else
1744                                 status = 0;
1745                 } else
1746                         status = -EINTR;
1747                 finish_wait(&state->waitq, &wait);
1748                 rcu_read_lock();
1749                 spin_lock(&state->owner->so_lock);
1750                 write_seqlock(&state->seqlock);
1751         }
1752
1753         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1754             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1755                 nfs4_stateid_copy(freeme, &state->open_stateid);
1756                 nfs_test_and_clear_all_open_stateid(state);
1757         }
1758
1759         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1760                 nfs4_stateid_copy(&state->stateid, stateid);
1761         nfs4_stateid_copy(&state->open_stateid, stateid);
1762         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1763         nfs_state_log_update_open_stateid(state);
1764 }
1765
1766 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1767                 const nfs4_stateid *open_stateid,
1768                 fmode_t fmode,
1769                 nfs4_stateid *freeme)
1770 {
1771         /*
1772          * Protect the call to nfs4_state_set_mode_locked and
1773          * serialise the stateid update
1774          */
1775         write_seqlock(&state->seqlock);
1776         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1777         switch (fmode) {
1778         case FMODE_READ:
1779                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1780                 break;
1781         case FMODE_WRITE:
1782                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1783                 break;
1784         case FMODE_READ|FMODE_WRITE:
1785                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1786         }
1787         set_bit(NFS_OPEN_STATE, &state->flags);
1788         write_sequnlock(&state->seqlock);
1789 }
1790
1791 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1792 {
1793         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1794         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1795         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1796         clear_bit(NFS_OPEN_STATE, &state->flags);
1797 }
1798
1799 static void nfs_state_set_delegation(struct nfs4_state *state,
1800                 const nfs4_stateid *deleg_stateid,
1801                 fmode_t fmode)
1802 {
1803         /*
1804          * Protect the call to nfs4_state_set_mode_locked and
1805          * serialise the stateid update
1806          */
1807         write_seqlock(&state->seqlock);
1808         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1809         set_bit(NFS_DELEGATED_STATE, &state->flags);
1810         write_sequnlock(&state->seqlock);
1811 }
1812
1813 static void nfs_state_clear_delegation(struct nfs4_state *state)
1814 {
1815         write_seqlock(&state->seqlock);
1816         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1817         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1818         write_sequnlock(&state->seqlock);
1819 }
1820
1821 int update_open_stateid(struct nfs4_state *state,
1822                 const nfs4_stateid *open_stateid,
1823                 const nfs4_stateid *delegation,
1824                 fmode_t fmode)
1825 {
1826         struct nfs_server *server = NFS_SERVER(state->inode);
1827         struct nfs_client *clp = server->nfs_client;
1828         struct nfs_inode *nfsi = NFS_I(state->inode);
1829         struct nfs_delegation *deleg_cur;
1830         nfs4_stateid freeme = { };
1831         int ret = 0;
1832
1833         fmode &= (FMODE_READ|FMODE_WRITE);
1834
1835         rcu_read_lock();
1836         spin_lock(&state->owner->so_lock);
1837         if (open_stateid != NULL) {
1838                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1839                 ret = 1;
1840         }
1841
1842         deleg_cur = nfs4_get_valid_delegation(state->inode);
1843         if (deleg_cur == NULL)
1844                 goto no_delegation;
1845
1846         spin_lock(&deleg_cur->lock);
1847         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1848            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1849             (deleg_cur->type & fmode) != fmode)
1850                 goto no_delegation_unlock;
1851
1852         if (delegation == NULL)
1853                 delegation = &deleg_cur->stateid;
1854         else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1855                 goto no_delegation_unlock;
1856
1857         nfs_mark_delegation_referenced(deleg_cur);
1858         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1859         ret = 1;
1860 no_delegation_unlock:
1861         spin_unlock(&deleg_cur->lock);
1862 no_delegation:
1863         if (ret)
1864                 update_open_stateflags(state, fmode);
1865         spin_unlock(&state->owner->so_lock);
1866         rcu_read_unlock();
1867
1868         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1869                 nfs4_schedule_state_manager(clp);
1870         if (freeme.type != 0)
1871                 nfs4_test_and_free_stateid(server, &freeme,
1872                                 state->owner->so_cred);
1873
1874         return ret;
1875 }
1876
1877 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1878                 const nfs4_stateid *stateid)
1879 {
1880         struct nfs4_state *state = lsp->ls_state;
1881         bool ret = false;
1882
1883         spin_lock(&state->state_lock);
1884         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1885                 goto out_noupdate;
1886         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1887                 goto out_noupdate;
1888         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1889         ret = true;
1890 out_noupdate:
1891         spin_unlock(&state->state_lock);
1892         return ret;
1893 }
1894
1895 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1896 {
1897         struct nfs_delegation *delegation;
1898
1899         fmode &= FMODE_READ|FMODE_WRITE;
1900         rcu_read_lock();
1901         delegation = nfs4_get_valid_delegation(inode);
1902         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1903                 rcu_read_unlock();
1904                 return;
1905         }
1906         rcu_read_unlock();
1907         nfs4_inode_return_delegation(inode);
1908 }
1909
1910 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1911 {
1912         struct nfs4_state *state = opendata->state;
1913         struct nfs_delegation *delegation;
1914         int open_mode = opendata->o_arg.open_flags;
1915         fmode_t fmode = opendata->o_arg.fmode;
1916         enum open_claim_type4 claim = opendata->o_arg.claim;
1917         nfs4_stateid stateid;
1918         int ret = -EAGAIN;
1919
1920         for (;;) {
1921                 spin_lock(&state->owner->so_lock);
1922                 if (can_open_cached(state, fmode, open_mode, claim)) {
1923                         update_open_stateflags(state, fmode);
1924                         spin_unlock(&state->owner->so_lock);
1925                         goto out_return_state;
1926                 }
1927                 spin_unlock(&state->owner->so_lock);
1928                 rcu_read_lock();
1929                 delegation = nfs4_get_valid_delegation(state->inode);
1930                 if (!can_open_delegated(delegation, fmode, claim)) {
1931                         rcu_read_unlock();
1932                         break;
1933                 }
1934                 /* Save the delegation */
1935                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1936                 rcu_read_unlock();
1937                 nfs_release_seqid(opendata->o_arg.seqid);
1938                 if (!opendata->is_recover) {
1939                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1940                         if (ret != 0)
1941                                 goto out;
1942                 }
1943                 ret = -EAGAIN;
1944
1945                 /* Try to update the stateid using the delegation */
1946                 if (update_open_stateid(state, NULL, &stateid, fmode))
1947                         goto out_return_state;
1948         }
1949 out:
1950         return ERR_PTR(ret);
1951 out_return_state:
1952         refcount_inc(&state->count);
1953         return state;
1954 }
1955
1956 static void
1957 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1958 {
1959         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1960         struct nfs_delegation *delegation;
1961         int delegation_flags = 0;
1962
1963         rcu_read_lock();
1964         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1965         if (delegation)
1966                 delegation_flags = delegation->flags;
1967         rcu_read_unlock();
1968         switch (data->o_arg.claim) {
1969         default:
1970                 break;
1971         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1972         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1973                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1974                                    "returning a delegation for "
1975                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1976                                    clp->cl_hostname);
1977                 return;
1978         }
1979         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1980                 nfs_inode_set_delegation(state->inode,
1981                                 data->owner->so_cred,
1982                                 data->o_res.delegation_type,
1983                                 &data->o_res.delegation,
1984                                 data->o_res.pagemod_limit);
1985         else
1986                 nfs_inode_reclaim_delegation(state->inode,
1987                                 data->owner->so_cred,
1988                                 data->o_res.delegation_type,
1989                                 &data->o_res.delegation,
1990                                 data->o_res.pagemod_limit);
1991
1992         if (data->o_res.do_recall)
1993                 nfs_async_inode_return_delegation(state->inode,
1994                                                   &data->o_res.delegation);
1995 }
1996
1997 /*
1998  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1999  * and update the nfs4_state.
2000  */
2001 static struct nfs4_state *
2002 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
2003 {
2004         struct inode *inode = data->state->inode;
2005         struct nfs4_state *state = data->state;
2006         int ret;
2007
2008         if (!data->rpc_done) {
2009                 if (data->rpc_status)
2010                         return ERR_PTR(data->rpc_status);
2011                 return nfs4_try_open_cached(data);
2012         }
2013
2014         ret = nfs_refresh_inode(inode, &data->f_attr);
2015         if (ret)
2016                 return ERR_PTR(ret);
2017
2018         if (data->o_res.delegation_type != 0)
2019                 nfs4_opendata_check_deleg(data, state);
2020
2021         if (!update_open_stateid(state, &data->o_res.stateid,
2022                                 NULL, data->o_arg.fmode))
2023                 return ERR_PTR(-EAGAIN);
2024         refcount_inc(&state->count);
2025
2026         return state;
2027 }
2028
2029 static struct inode *
2030 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2031 {
2032         struct inode *inode;
2033
2034         switch (data->o_arg.claim) {
2035         case NFS4_OPEN_CLAIM_NULL:
2036         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2037         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2038                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2039                         return ERR_PTR(-EAGAIN);
2040                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2041                                 &data->f_attr);
2042                 break;
2043         default:
2044                 inode = d_inode(data->dentry);
2045                 ihold(inode);
2046                 nfs_refresh_inode(inode, &data->f_attr);
2047         }
2048         return inode;
2049 }
2050
2051 static struct nfs4_state *
2052 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2053 {
2054         struct nfs4_state *state;
2055         struct inode *inode;
2056
2057         inode = nfs4_opendata_get_inode(data);
2058         if (IS_ERR(inode))
2059                 return ERR_CAST(inode);
2060         if (data->state != NULL && data->state->inode == inode) {
2061                 state = data->state;
2062                 refcount_inc(&state->count);
2063         } else
2064                 state = nfs4_get_open_state(inode, data->owner);
2065         iput(inode);
2066         if (state == NULL)
2067                 state = ERR_PTR(-ENOMEM);
2068         return state;
2069 }
2070
2071 static struct nfs4_state *
2072 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2073 {
2074         struct nfs4_state *state;
2075
2076         if (!data->rpc_done) {
2077                 state = nfs4_try_open_cached(data);
2078                 trace_nfs4_cached_open(data->state);
2079                 goto out;
2080         }
2081
2082         state = nfs4_opendata_find_nfs4_state(data);
2083         if (IS_ERR(state))
2084                 goto out;
2085
2086         if (data->o_res.delegation_type != 0)
2087                 nfs4_opendata_check_deleg(data, state);
2088         if (!update_open_stateid(state, &data->o_res.stateid,
2089                                 NULL, data->o_arg.fmode)) {
2090                 nfs4_put_open_state(state);
2091                 state = ERR_PTR(-EAGAIN);
2092         }
2093 out:
2094         nfs_release_seqid(data->o_arg.seqid);
2095         return state;
2096 }
2097
2098 static struct nfs4_state *
2099 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2100 {
2101         struct nfs4_state *ret;
2102
2103         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2104                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2105         else
2106                 ret = _nfs4_opendata_to_nfs4_state(data);
2107         nfs4_sequence_free_slot(&data->o_res.seq_res);
2108         return ret;
2109 }
2110
2111 static struct nfs_open_context *
2112 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2113 {
2114         struct nfs_inode *nfsi = NFS_I(state->inode);
2115         struct nfs_open_context *ctx;
2116
2117         rcu_read_lock();
2118         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2119                 if (ctx->state != state)
2120                         continue;
2121                 if ((ctx->mode & mode) != mode)
2122                         continue;
2123                 if (!get_nfs_open_context(ctx))
2124                         continue;
2125                 rcu_read_unlock();
2126                 return ctx;
2127         }
2128         rcu_read_unlock();
2129         return ERR_PTR(-ENOENT);
2130 }
2131
2132 static struct nfs_open_context *
2133 nfs4_state_find_open_context(struct nfs4_state *state)
2134 {
2135         struct nfs_open_context *ctx;
2136
2137         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2138         if (!IS_ERR(ctx))
2139                 return ctx;
2140         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2141         if (!IS_ERR(ctx))
2142                 return ctx;
2143         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2144 }
2145
2146 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2147                 struct nfs4_state *state, enum open_claim_type4 claim)
2148 {
2149         struct nfs4_opendata *opendata;
2150
2151         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2152                         NULL, claim, GFP_NOFS);
2153         if (opendata == NULL)
2154                 return ERR_PTR(-ENOMEM);
2155         opendata->state = state;
2156         refcount_inc(&state->count);
2157         return opendata;
2158 }
2159
2160 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2161                                     fmode_t fmode)
2162 {
2163         struct nfs4_state *newstate;
2164         struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2165         int openflags = opendata->o_arg.open_flags;
2166         int ret;
2167
2168         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2169                 return 0;
2170         opendata->o_arg.fmode = fmode;
2171         opendata->o_arg.share_access =
2172                 nfs4_map_atomic_open_share(server, fmode, openflags);
2173         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2174         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2175         nfs4_init_opendata_res(opendata);
2176         ret = _nfs4_recover_proc_open(opendata);
2177         if (ret != 0)
2178                 return ret;
2179         newstate = nfs4_opendata_to_nfs4_state(opendata);
2180         if (IS_ERR(newstate))
2181                 return PTR_ERR(newstate);
2182         if (newstate != opendata->state)
2183                 ret = -ESTALE;
2184         nfs4_close_state(newstate, fmode);
2185         return ret;
2186 }
2187
2188 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2189 {
2190         int ret;
2191
2192         /* memory barrier prior to reading state->n_* */
2193         smp_rmb();
2194         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2195         if (ret != 0)
2196                 return ret;
2197         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2198         if (ret != 0)
2199                 return ret;
2200         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2201         if (ret != 0)
2202                 return ret;
2203         /*
2204          * We may have performed cached opens for all three recoveries.
2205          * Check if we need to update the current stateid.
2206          */
2207         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2208             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2209                 write_seqlock(&state->seqlock);
2210                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2211                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2212                 write_sequnlock(&state->seqlock);
2213         }
2214         return 0;
2215 }
2216
2217 /*
2218  * OPEN_RECLAIM:
2219  *      reclaim state on the server after a reboot.
2220  */
2221 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2222 {
2223         struct nfs_delegation *delegation;
2224         struct nfs4_opendata *opendata;
2225         fmode_t delegation_type = 0;
2226         int status;
2227
2228         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2229                         NFS4_OPEN_CLAIM_PREVIOUS);
2230         if (IS_ERR(opendata))
2231                 return PTR_ERR(opendata);
2232         rcu_read_lock();
2233         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2234         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2235                 delegation_type = delegation->type;
2236         rcu_read_unlock();
2237         opendata->o_arg.u.delegation_type = delegation_type;
2238         status = nfs4_open_recover(opendata, state);
2239         nfs4_opendata_put(opendata);
2240         return status;
2241 }
2242
2243 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2244 {
2245         struct nfs_server *server = NFS_SERVER(state->inode);
2246         struct nfs4_exception exception = { };
2247         int err;
2248         do {
2249                 err = _nfs4_do_open_reclaim(ctx, state);
2250                 trace_nfs4_open_reclaim(ctx, 0, err);
2251                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2252                         continue;
2253                 if (err != -NFS4ERR_DELAY)
2254                         break;
2255                 nfs4_handle_exception(server, err, &exception);
2256         } while (exception.retry);
2257         return err;
2258 }
2259
2260 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2261 {
2262         struct nfs_open_context *ctx;
2263         int ret;
2264
2265         ctx = nfs4_state_find_open_context(state);
2266         if (IS_ERR(ctx))
2267                 return -EAGAIN;
2268         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2269         nfs_state_clear_open_state_flags(state);
2270         ret = nfs4_do_open_reclaim(ctx, state);
2271         put_nfs_open_context(ctx);
2272         return ret;
2273 }
2274
2275 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2276 {
2277         switch (err) {
2278                 default:
2279                         printk(KERN_ERR "NFS: %s: unhandled error "
2280                                         "%d.\n", __func__, err);
2281                         fallthrough;
2282                 case 0:
2283                 case -ENOENT:
2284                 case -EAGAIN:
2285                 case -ESTALE:
2286                 case -ETIMEDOUT:
2287                         break;
2288                 case -NFS4ERR_BADSESSION:
2289                 case -NFS4ERR_BADSLOT:
2290                 case -NFS4ERR_BAD_HIGH_SLOT:
2291                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2292                 case -NFS4ERR_DEADSESSION:
2293                         return -EAGAIN;
2294                 case -NFS4ERR_STALE_CLIENTID:
2295                 case -NFS4ERR_STALE_STATEID:
2296                         /* Don't recall a delegation if it was lost */
2297                         nfs4_schedule_lease_recovery(server->nfs_client);
2298                         return -EAGAIN;
2299                 case -NFS4ERR_MOVED:
2300                         nfs4_schedule_migration_recovery(server);
2301                         return -EAGAIN;
2302                 case -NFS4ERR_LEASE_MOVED:
2303                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2304                         return -EAGAIN;
2305                 case -NFS4ERR_DELEG_REVOKED:
2306                 case -NFS4ERR_ADMIN_REVOKED:
2307                 case -NFS4ERR_EXPIRED:
2308                 case -NFS4ERR_BAD_STATEID:
2309                 case -NFS4ERR_OPENMODE:
2310                         nfs_inode_find_state_and_recover(state->inode,
2311                                         stateid);
2312                         nfs4_schedule_stateid_recovery(server, state);
2313                         return -EAGAIN;
2314                 case -NFS4ERR_DELAY:
2315                 case -NFS4ERR_GRACE:
2316                         ssleep(1);
2317                         return -EAGAIN;
2318                 case -ENOMEM:
2319                 case -NFS4ERR_DENIED:
2320                         if (fl) {
2321                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2322                                 if (lsp)
2323                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2324                         }
2325                         return 0;
2326         }
2327         return err;
2328 }
2329
2330 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2331                 struct nfs4_state *state, const nfs4_stateid *stateid)
2332 {
2333         struct nfs_server *server = NFS_SERVER(state->inode);
2334         struct nfs4_opendata *opendata;
2335         int err = 0;
2336
2337         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2338                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2339         if (IS_ERR(opendata))
2340                 return PTR_ERR(opendata);
2341         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2342         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2343                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2344                 if (err)
2345                         goto out;
2346         }
2347         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2348                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2349                 if (err)
2350                         goto out;
2351         }
2352         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2353                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2354                 if (err)
2355                         goto out;
2356         }
2357         nfs_state_clear_delegation(state);
2358 out:
2359         nfs4_opendata_put(opendata);
2360         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2361 }
2362
2363 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2364 {
2365         struct nfs4_opendata *data = calldata;
2366
2367         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2368                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2369 }
2370
2371 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2372 {
2373         struct nfs4_opendata *data = calldata;
2374
2375         nfs40_sequence_done(task, &data->c_res.seq_res);
2376
2377         data->rpc_status = task->tk_status;
2378         if (data->rpc_status == 0) {
2379                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2380                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2381                 renew_lease(data->o_res.server, data->timestamp);
2382                 data->rpc_done = true;
2383         }
2384 }
2385
2386 static void nfs4_open_confirm_release(void *calldata)
2387 {
2388         struct nfs4_opendata *data = calldata;
2389         struct nfs4_state *state = NULL;
2390
2391         /* If this request hasn't been cancelled, do nothing */
2392         if (!data->cancelled)
2393                 goto out_free;
2394         /* In case of error, no cleanup! */
2395         if (!data->rpc_done)
2396                 goto out_free;
2397         state = nfs4_opendata_to_nfs4_state(data);
2398         if (!IS_ERR(state))
2399                 nfs4_close_state(state, data->o_arg.fmode);
2400 out_free:
2401         nfs4_opendata_put(data);
2402 }
2403
2404 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2405         .rpc_call_prepare = nfs4_open_confirm_prepare,
2406         .rpc_call_done = nfs4_open_confirm_done,
2407         .rpc_release = nfs4_open_confirm_release,
2408 };
2409
2410 /*
2411  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2412  */
2413 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2414 {
2415         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2416         struct rpc_task *task;
2417         struct  rpc_message msg = {
2418                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2419                 .rpc_argp = &data->c_arg,
2420                 .rpc_resp = &data->c_res,
2421                 .rpc_cred = data->owner->so_cred,
2422         };
2423         struct rpc_task_setup task_setup_data = {
2424                 .rpc_client = server->client,
2425                 .rpc_message = &msg,
2426                 .callback_ops = &nfs4_open_confirm_ops,
2427                 .callback_data = data,
2428                 .workqueue = nfsiod_workqueue,
2429                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2430         };
2431         int status;
2432
2433         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2434                                 data->is_recover);
2435         kref_get(&data->kref);
2436         data->rpc_done = false;
2437         data->rpc_status = 0;
2438         data->timestamp = jiffies;
2439         task = rpc_run_task(&task_setup_data);
2440         if (IS_ERR(task))
2441                 return PTR_ERR(task);
2442         status = rpc_wait_for_completion_task(task);
2443         if (status != 0) {
2444                 data->cancelled = true;
2445                 smp_wmb();
2446         } else
2447                 status = data->rpc_status;
2448         rpc_put_task(task);
2449         return status;
2450 }
2451
2452 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2453 {
2454         struct nfs4_opendata *data = calldata;
2455         struct nfs4_state_owner *sp = data->owner;
2456         struct nfs_client *clp = sp->so_server->nfs_client;
2457         enum open_claim_type4 claim = data->o_arg.claim;
2458
2459         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2460                 goto out_wait;
2461         /*
2462          * Check if we still need to send an OPEN call, or if we can use
2463          * a delegation instead.
2464          */
2465         if (data->state != NULL) {
2466                 struct nfs_delegation *delegation;
2467
2468                 if (can_open_cached(data->state, data->o_arg.fmode,
2469                                         data->o_arg.open_flags, claim))
2470                         goto out_no_action;
2471                 rcu_read_lock();
2472                 delegation = nfs4_get_valid_delegation(data->state->inode);
2473                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2474                         goto unlock_no_action;
2475                 rcu_read_unlock();
2476         }
2477         /* Update client id. */
2478         data->o_arg.clientid = clp->cl_clientid;
2479         switch (claim) {
2480         default:
2481                 break;
2482         case NFS4_OPEN_CLAIM_PREVIOUS:
2483         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2484         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2485                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2486                 fallthrough;
2487         case NFS4_OPEN_CLAIM_FH:
2488                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2489         }
2490         data->timestamp = jiffies;
2491         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2492                                 &data->o_arg.seq_args,
2493                                 &data->o_res.seq_res,
2494                                 task) != 0)
2495                 nfs_release_seqid(data->o_arg.seqid);
2496
2497         /* Set the create mode (note dependency on the session type) */
2498         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2499         if (data->o_arg.open_flags & O_EXCL) {
2500                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2501                 if (clp->cl_mvops->minor_version == 0) {
2502                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2503                         /* don't put an ACCESS op in OPEN compound if O_EXCL,
2504                          * because ACCESS will return permission denied for
2505                          * all bits until close */
2506                         data->o_res.access_request = data->o_arg.access = 0;
2507                 } else if (nfs4_has_persistent_session(clp))
2508                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2509         }
2510         return;
2511 unlock_no_action:
2512         trace_nfs4_cached_open(data->state);
2513         rcu_read_unlock();
2514 out_no_action:
2515         task->tk_action = NULL;
2516 out_wait:
2517         nfs4_sequence_done(task, &data->o_res.seq_res);
2518 }
2519
2520 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2521 {
2522         struct nfs4_opendata *data = calldata;
2523
2524         data->rpc_status = task->tk_status;
2525
2526         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2527                 return;
2528
2529         if (task->tk_status == 0) {
2530                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2531                         switch (data->o_res.f_attr->mode & S_IFMT) {
2532                         case S_IFREG:
2533                                 break;
2534                         case S_IFLNK:
2535                                 data->rpc_status = -ELOOP;
2536                                 break;
2537                         case S_IFDIR:
2538                                 data->rpc_status = -EISDIR;
2539                                 break;
2540                         default:
2541                                 data->rpc_status = -ENOTDIR;
2542                         }
2543                 }
2544                 renew_lease(data->o_res.server, data->timestamp);
2545                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2546                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2547         }
2548         data->rpc_done = true;
2549 }
2550
2551 static void nfs4_open_release(void *calldata)
2552 {
2553         struct nfs4_opendata *data = calldata;
2554         struct nfs4_state *state = NULL;
2555
2556         /* If this request hasn't been cancelled, do nothing */
2557         if (!data->cancelled)
2558                 goto out_free;
2559         /* In case of error, no cleanup! */
2560         if (data->rpc_status != 0 || !data->rpc_done)
2561                 goto out_free;
2562         /* In case we need an open_confirm, no cleanup! */
2563         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2564                 goto out_free;
2565         state = nfs4_opendata_to_nfs4_state(data);
2566         if (!IS_ERR(state))
2567                 nfs4_close_state(state, data->o_arg.fmode);
2568 out_free:
2569         nfs4_opendata_put(data);
2570 }
2571
2572 static const struct rpc_call_ops nfs4_open_ops = {
2573         .rpc_call_prepare = nfs4_open_prepare,
2574         .rpc_call_done = nfs4_open_done,
2575         .rpc_release = nfs4_open_release,
2576 };
2577
2578 static int nfs4_run_open_task(struct nfs4_opendata *data,
2579                               struct nfs_open_context *ctx)
2580 {
2581         struct inode *dir = d_inode(data->dir);
2582         struct nfs_server *server = NFS_SERVER(dir);
2583         struct nfs_openargs *o_arg = &data->o_arg;
2584         struct nfs_openres *o_res = &data->o_res;
2585         struct rpc_task *task;
2586         struct rpc_message msg = {
2587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2588                 .rpc_argp = o_arg,
2589                 .rpc_resp = o_res,
2590                 .rpc_cred = data->owner->so_cred,
2591         };
2592         struct rpc_task_setup task_setup_data = {
2593                 .rpc_client = server->client,
2594                 .rpc_message = &msg,
2595                 .callback_ops = &nfs4_open_ops,
2596                 .callback_data = data,
2597                 .workqueue = nfsiod_workqueue,
2598                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2599         };
2600         int status;
2601
2602         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2603                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2604
2605         kref_get(&data->kref);
2606         data->rpc_done = false;
2607         data->rpc_status = 0;
2608         data->cancelled = false;
2609         data->is_recover = false;
2610         if (!ctx) {
2611                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2612                 data->is_recover = true;
2613                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2614         } else {
2615                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2616                 pnfs_lgopen_prepare(data, ctx);
2617         }
2618         task = rpc_run_task(&task_setup_data);
2619         if (IS_ERR(task))
2620                 return PTR_ERR(task);
2621         status = rpc_wait_for_completion_task(task);
2622         if (status != 0) {
2623                 data->cancelled = true;
2624                 smp_wmb();
2625         } else
2626                 status = data->rpc_status;
2627         rpc_put_task(task);
2628
2629         return status;
2630 }
2631
2632 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2633 {
2634         struct inode *dir = d_inode(data->dir);
2635         struct nfs_openres *o_res = &data->o_res;
2636         int status;
2637
2638         status = nfs4_run_open_task(data, NULL);
2639         if (status != 0 || !data->rpc_done)
2640                 return status;
2641
2642         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2643
2644         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2645                 status = _nfs4_proc_open_confirm(data);
2646
2647         return status;
2648 }
2649
2650 /*
2651  * Additional permission checks in order to distinguish between an
2652  * open for read, and an open for execute. This works around the
2653  * fact that NFSv4 OPEN treats read and execute permissions as being
2654  * the same.
2655  * Note that in the non-execute case, we want to turn off permission
2656  * checking if we just created a new file (POSIX open() semantics).
2657  */
2658 static int nfs4_opendata_access(const struct cred *cred,
2659                                 struct nfs4_opendata *opendata,
2660                                 struct nfs4_state *state, fmode_t fmode)
2661 {
2662         struct nfs_access_entry cache;
2663         u32 mask, flags;
2664
2665         /* access call failed or for some reason the server doesn't
2666          * support any access modes -- defer access call until later */
2667         if (opendata->o_res.access_supported == 0)
2668                 return 0;
2669
2670         mask = 0;
2671         if (fmode & FMODE_EXEC) {
2672                 /* ONLY check for exec rights */
2673                 if (S_ISDIR(state->inode->i_mode))
2674                         mask = NFS4_ACCESS_LOOKUP;
2675                 else
2676                         mask = NFS4_ACCESS_EXECUTE;
2677         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2678                 mask = NFS4_ACCESS_READ;
2679
2680         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2681         nfs_access_add_cache(state->inode, &cache, cred);
2682
2683         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2684         if ((mask & ~cache.mask & flags) == 0)
2685                 return 0;
2686
2687         return -EACCES;
2688 }
2689
2690 /*
2691  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2692  */
2693 static int _nfs4_proc_open(struct nfs4_opendata *data,
2694                            struct nfs_open_context *ctx)
2695 {
2696         struct inode *dir = d_inode(data->dir);
2697         struct nfs_server *server = NFS_SERVER(dir);
2698         struct nfs_openargs *o_arg = &data->o_arg;
2699         struct nfs_openres *o_res = &data->o_res;
2700         int status;
2701
2702         status = nfs4_run_open_task(data, ctx);
2703         if (!data->rpc_done)
2704                 return status;
2705         if (status != 0) {
2706                 if (status == -NFS4ERR_BADNAME &&
2707                                 !(o_arg->open_flags & O_CREAT))
2708                         return -ENOENT;
2709                 return status;
2710         }
2711
2712         nfs_fattr_map_and_free_names(server, &data->f_attr);
2713
2714         if (o_arg->open_flags & O_CREAT) {
2715                 if (o_arg->open_flags & O_EXCL)
2716                         data->file_created = true;
2717                 else if (o_res->cinfo.before != o_res->cinfo.after)
2718                         data->file_created = true;
2719                 if (data->file_created ||
2720                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2721                         nfs4_update_changeattr(dir, &o_res->cinfo,
2722                                         o_res->f_attr->time_start,
2723                                         NFS_INO_INVALID_DATA);
2724         }
2725         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2726                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2727         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2728                 status = _nfs4_proc_open_confirm(data);
2729                 if (status != 0)
2730                         return status;
2731         }
2732         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2733                 struct nfs_fh *fh = &o_res->fh;
2734
2735                 nfs4_sequence_free_slot(&o_res->seq_res);
2736                 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2737                         fh = NFS_FH(d_inode(data->dentry));
2738                 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2739         }
2740         return 0;
2741 }
2742
2743 /*
2744  * OPEN_EXPIRED:
2745  *      reclaim state on the server after a network partition.
2746  *      Assumes caller holds the appropriate lock
2747  */
2748 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2749 {
2750         struct nfs4_opendata *opendata;
2751         int ret;
2752
2753         opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2754         if (IS_ERR(opendata))
2755                 return PTR_ERR(opendata);
2756         /*
2757          * We're not recovering a delegation, so ask for no delegation.
2758          * Otherwise the recovery thread could deadlock with an outstanding
2759          * delegation return.
2760          */
2761         opendata->o_arg.open_flags = O_DIRECT;
2762         ret = nfs4_open_recover(opendata, state);
2763         if (ret == -ESTALE)
2764                 d_drop(ctx->dentry);
2765         nfs4_opendata_put(opendata);
2766         return ret;
2767 }
2768
2769 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2770 {
2771         struct nfs_server *server = NFS_SERVER(state->inode);
2772         struct nfs4_exception exception = { };
2773         int err;
2774
2775         do {
2776                 err = _nfs4_open_expired(ctx, state);
2777                 trace_nfs4_open_expired(ctx, 0, err);
2778                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2779                         continue;
2780                 switch (err) {
2781                 default:
2782                         goto out;
2783                 case -NFS4ERR_GRACE:
2784                 case -NFS4ERR_DELAY:
2785                         nfs4_handle_exception(server, err, &exception);
2786                         err = 0;
2787                 }
2788         } while (exception.retry);
2789 out:
2790         return err;
2791 }
2792
2793 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2794 {
2795         struct nfs_open_context *ctx;
2796         int ret;
2797
2798         ctx = nfs4_state_find_open_context(state);
2799         if (IS_ERR(ctx))
2800                 return -EAGAIN;
2801         ret = nfs4_do_open_expired(ctx, state);
2802         put_nfs_open_context(ctx);
2803         return ret;
2804 }
2805
2806 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2807                 const nfs4_stateid *stateid)
2808 {
2809         nfs_remove_bad_delegation(state->inode, stateid);
2810         nfs_state_clear_delegation(state);
2811 }
2812
2813 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2814 {
2815         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2816                 nfs_finish_clear_delegation_stateid(state, NULL);
2817 }
2818
2819 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2820 {
2821         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2822         nfs40_clear_delegation_stateid(state);
2823         nfs_state_clear_open_state_flags(state);
2824         return nfs4_open_expired(sp, state);
2825 }
2826
2827 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2828                 nfs4_stateid *stateid,
2829                 const struct cred *cred)
2830 {
2831         return -NFS4ERR_BAD_STATEID;
2832 }
2833
2834 #if defined(CONFIG_NFS_V4_1)
2835 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2836                 nfs4_stateid *stateid,
2837                 const struct cred *cred)
2838 {
2839         int status;
2840
2841         switch (stateid->type) {
2842         default:
2843                 break;
2844         case NFS4_INVALID_STATEID_TYPE:
2845         case NFS4_SPECIAL_STATEID_TYPE:
2846                 return -NFS4ERR_BAD_STATEID;
2847         case NFS4_REVOKED_STATEID_TYPE:
2848                 goto out_free;
2849         }
2850
2851         status = nfs41_test_stateid(server, stateid, cred);
2852         switch (status) {
2853         case -NFS4ERR_EXPIRED:
2854         case -NFS4ERR_ADMIN_REVOKED:
2855         case -NFS4ERR_DELEG_REVOKED:
2856                 break;
2857         default:
2858                 return status;
2859         }
2860 out_free:
2861         /* Ack the revoked state to the server */
2862         nfs41_free_stateid(server, stateid, cred, true);
2863         return -NFS4ERR_EXPIRED;
2864 }
2865
2866 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2867 {
2868         struct nfs_server *server = NFS_SERVER(state->inode);
2869         nfs4_stateid stateid;
2870         struct nfs_delegation *delegation;
2871         const struct cred *cred = NULL;
2872         int status, ret = NFS_OK;
2873
2874         /* Get the delegation credential for use by test/free_stateid */
2875         rcu_read_lock();
2876         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2877         if (delegation == NULL) {
2878                 rcu_read_unlock();
2879                 nfs_state_clear_delegation(state);
2880                 return NFS_OK;
2881         }
2882
2883         spin_lock(&delegation->lock);
2884         nfs4_stateid_copy(&stateid, &delegation->stateid);
2885
2886         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2887                                 &delegation->flags)) {
2888                 spin_unlock(&delegation->lock);
2889                 rcu_read_unlock();
2890                 return NFS_OK;
2891         }
2892
2893         if (delegation->cred)
2894                 cred = get_cred(delegation->cred);
2895         spin_unlock(&delegation->lock);
2896         rcu_read_unlock();
2897         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2898         trace_nfs4_test_delegation_stateid(state, NULL, status);
2899         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2900                 nfs_finish_clear_delegation_stateid(state, &stateid);
2901         else
2902                 ret = status;
2903
2904         put_cred(cred);
2905         return ret;
2906 }
2907
2908 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2909 {
2910         nfs4_stateid tmp;
2911
2912         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2913             nfs4_copy_delegation_stateid(state->inode, state->state,
2914                                 &tmp, NULL) &&
2915             nfs4_stateid_match_other(&state->stateid, &tmp))
2916                 nfs_state_set_delegation(state, &tmp, state->state);
2917         else
2918                 nfs_state_clear_delegation(state);
2919 }
2920
2921 /**
2922  * nfs41_check_expired_locks - possibly free a lock stateid
2923  *
2924  * @state: NFSv4 state for an inode
2925  *
2926  * Returns NFS_OK if recovery for this stateid is now finished.
2927  * Otherwise a negative NFS4ERR value is returned.
2928  */
2929 static int nfs41_check_expired_locks(struct nfs4_state *state)
2930 {
2931         int status, ret = NFS_OK;
2932         struct nfs4_lock_state *lsp, *prev = NULL;
2933         struct nfs_server *server = NFS_SERVER(state->inode);
2934
2935         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2936                 goto out;
2937
2938         spin_lock(&state->state_lock);
2939         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2940                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2941                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2942
2943                         refcount_inc(&lsp->ls_count);
2944                         spin_unlock(&state->state_lock);
2945
2946                         nfs4_put_lock_state(prev);
2947                         prev = lsp;
2948
2949                         status = nfs41_test_and_free_expired_stateid(server,
2950                                         &lsp->ls_stateid,
2951                                         cred);
2952                         trace_nfs4_test_lock_stateid(state, lsp, status);
2953                         if (status == -NFS4ERR_EXPIRED ||
2954                             status == -NFS4ERR_BAD_STATEID) {
2955                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2956                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2957                                 if (!recover_lost_locks)
2958                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2959                         } else if (status != NFS_OK) {
2960                                 ret = status;
2961                                 nfs4_put_lock_state(prev);
2962                                 goto out;
2963                         }
2964                         spin_lock(&state->state_lock);
2965                 }
2966         }
2967         spin_unlock(&state->state_lock);
2968         nfs4_put_lock_state(prev);
2969 out:
2970         return ret;
2971 }
2972
2973 /**
2974  * nfs41_check_open_stateid - possibly free an open stateid
2975  *
2976  * @state: NFSv4 state for an inode
2977  *
2978  * Returns NFS_OK if recovery for this stateid is now finished.
2979  * Otherwise a negative NFS4ERR value is returned.
2980  */
2981 static int nfs41_check_open_stateid(struct nfs4_state *state)
2982 {
2983         struct nfs_server *server = NFS_SERVER(state->inode);
2984         nfs4_stateid *stateid = &state->open_stateid;
2985         const struct cred *cred = state->owner->so_cred;
2986         int status;
2987
2988         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2989                 return -NFS4ERR_BAD_STATEID;
2990         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2991         trace_nfs4_test_open_stateid(state, NULL, status);
2992         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2993                 nfs_state_clear_open_state_flags(state);
2994                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2995                 return status;
2996         }
2997         if (nfs_open_stateid_recover_openmode(state))
2998                 return -NFS4ERR_OPENMODE;
2999         return NFS_OK;
3000 }
3001
3002 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
3003 {
3004         int status;
3005
3006         status = nfs41_check_delegation_stateid(state);
3007         if (status != NFS_OK)
3008                 return status;
3009         nfs41_delegation_recover_stateid(state);
3010
3011         status = nfs41_check_expired_locks(state);
3012         if (status != NFS_OK)
3013                 return status;
3014         status = nfs41_check_open_stateid(state);
3015         if (status != NFS_OK)
3016                 status = nfs4_open_expired(sp, state);
3017         return status;
3018 }
3019 #endif
3020
3021 /*
3022  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
3023  * fields corresponding to attributes that were used to store the verifier.
3024  * Make sure we clobber those fields in the later setattr call
3025  */
3026 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3027                                 struct iattr *sattr, struct nfs4_label **label)
3028 {
3029         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3030         __u32 attrset[3];
3031         unsigned ret;
3032         unsigned i;
3033
3034         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3035                 attrset[i] = opendata->o_res.attrset[i];
3036                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3037                         attrset[i] &= ~bitmask[i];
3038         }
3039
3040         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3041                 sattr->ia_valid : 0;
3042
3043         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3044                 if (sattr->ia_valid & ATTR_ATIME_SET)
3045                         ret |= ATTR_ATIME_SET;
3046                 else
3047                         ret |= ATTR_ATIME;
3048         }
3049
3050         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3051                 if (sattr->ia_valid & ATTR_MTIME_SET)
3052                         ret |= ATTR_MTIME_SET;
3053                 else
3054                         ret |= ATTR_MTIME;
3055         }
3056
3057         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3058                 *label = NULL;
3059         return ret;
3060 }
3061
3062 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3063                 struct nfs_open_context *ctx)
3064 {
3065         struct nfs4_state_owner *sp = opendata->owner;
3066         struct nfs_server *server = sp->so_server;
3067         struct dentry *dentry;
3068         struct nfs4_state *state;
3069         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3070         struct inode *dir = d_inode(opendata->dir);
3071         unsigned long dir_verifier;
3072         int ret;
3073
3074         dir_verifier = nfs_save_change_attribute(dir);
3075
3076         ret = _nfs4_proc_open(opendata, ctx);
3077         if (ret != 0)
3078                 goto out;
3079
3080         state = _nfs4_opendata_to_nfs4_state(opendata);
3081         ret = PTR_ERR(state);
3082         if (IS_ERR(state))
3083                 goto out;
3084         ctx->state = state;
3085         if (server->caps & NFS_CAP_POSIX_LOCK)
3086                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3087         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3088                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3089         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3090                 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3091
3092         dentry = opendata->dentry;
3093         if (d_really_is_negative(dentry)) {
3094                 struct dentry *alias;
3095                 d_drop(dentry);
3096                 alias = d_exact_alias(dentry, state->inode);
3097                 if (!alias)
3098                         alias = d_splice_alias(igrab(state->inode), dentry);
3099                 /* d_splice_alias() can't fail here - it's a non-directory */
3100                 if (alias) {
3101                         dput(ctx->dentry);
3102                         ctx->dentry = dentry = alias;
3103                 }
3104         }
3105
3106         switch(opendata->o_arg.claim) {
3107         default:
3108                 break;
3109         case NFS4_OPEN_CLAIM_NULL:
3110         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3111         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3112                 if (!opendata->rpc_done)
3113                         break;
3114                 if (opendata->o_res.delegation_type != 0)
3115                         dir_verifier = nfs_save_change_attribute(dir);
3116                 nfs_set_verifier(dentry, dir_verifier);
3117         }
3118
3119         /* Parse layoutget results before we check for access */
3120         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3121
3122         ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3123         if (ret != 0)
3124                 goto out;
3125
3126         if (d_inode(dentry) == state->inode)
3127                 nfs_inode_attach_open_context(ctx);
3128
3129 out:
3130         if (!opendata->cancelled) {
3131                 if (opendata->lgp) {
3132                         nfs4_lgopen_release(opendata->lgp);
3133                         opendata->lgp = NULL;
3134                 }
3135                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3136         }
3137         return ret;
3138 }
3139
3140 /*
3141  * Returns a referenced nfs4_state
3142  */
3143 static int _nfs4_do_open(struct inode *dir,
3144                         struct nfs_open_context *ctx,
3145                         int flags,
3146                         const struct nfs4_open_createattrs *c,
3147                         int *opened)
3148 {
3149         struct nfs4_state_owner  *sp;
3150         struct nfs4_state     *state = NULL;
3151         struct nfs_server       *server = NFS_SERVER(dir);
3152         struct nfs4_opendata *opendata;
3153         struct dentry *dentry = ctx->dentry;
3154         const struct cred *cred = ctx->cred;
3155         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3156         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3157         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3158         struct iattr *sattr = c->sattr;
3159         struct nfs4_label *label = c->label;
3160         int status;
3161
3162         /* Protect against reboot recovery conflicts */
3163         status = -ENOMEM;
3164         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3165         if (sp == NULL) {
3166                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3167                 goto out_err;
3168         }
3169         status = nfs4_client_recover_expired_lease(server->nfs_client);
3170         if (status != 0)
3171                 goto err_put_state_owner;
3172         if (d_really_is_positive(dentry))
3173                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3174         status = -ENOMEM;
3175         if (d_really_is_positive(dentry))
3176                 claim = NFS4_OPEN_CLAIM_FH;
3177         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3178                         c, claim, GFP_KERNEL);
3179         if (opendata == NULL)
3180                 goto err_put_state_owner;
3181
3182         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3183                 if (!opendata->f_attr.mdsthreshold) {
3184                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3185                         if (!opendata->f_attr.mdsthreshold)
3186                                 goto err_opendata_put;
3187                 }
3188                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3189         }
3190         if (d_really_is_positive(dentry))
3191                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3192
3193         status = _nfs4_open_and_get_state(opendata, ctx);
3194         if (status != 0)
3195                 goto err_opendata_put;
3196         state = ctx->state;
3197
3198         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3199             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3200                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3201                 /*
3202                  * send create attributes which was not set by open
3203                  * with an extra setattr.
3204                  */
3205                 if (attrs || label) {
3206                         unsigned ia_old = sattr->ia_valid;
3207
3208                         sattr->ia_valid = attrs;
3209                         nfs_fattr_init(opendata->o_res.f_attr);
3210                         status = nfs4_do_setattr(state->inode, cred,
3211                                         opendata->o_res.f_attr, sattr,
3212                                         ctx, label);
3213                         if (status == 0) {
3214                                 nfs_setattr_update_inode(state->inode, sattr,
3215                                                 opendata->o_res.f_attr);
3216                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3217                         }
3218                         sattr->ia_valid = ia_old;
3219                 }
3220         }
3221         if (opened && opendata->file_created)
3222                 *opened = 1;
3223
3224         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3225                 *ctx_th = opendata->f_attr.mdsthreshold;
3226                 opendata->f_attr.mdsthreshold = NULL;
3227         }
3228
3229         nfs4_opendata_put(opendata);
3230         nfs4_put_state_owner(sp);
3231         return 0;
3232 err_opendata_put:
3233         nfs4_opendata_put(opendata);
3234 err_put_state_owner:
3235         nfs4_put_state_owner(sp);
3236 out_err:
3237         return status;
3238 }
3239
3240
3241 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3242                                         struct nfs_open_context *ctx,
3243                                         int flags,
3244                                         struct iattr *sattr,
3245                                         struct nfs4_label *label,
3246                                         int *opened)
3247 {
3248         struct nfs_server *server = NFS_SERVER(dir);
3249         struct nfs4_exception exception = {
3250                 .interruptible = true,
3251         };
3252         struct nfs4_state *res;
3253         struct nfs4_open_createattrs c = {
3254                 .label = label,
3255                 .sattr = sattr,
3256                 .verf = {
3257                         [0] = (__u32)jiffies,
3258                         [1] = (__u32)current->pid,
3259                 },
3260         };
3261         int status;
3262
3263         do {
3264                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3265                 res = ctx->state;
3266                 trace_nfs4_open_file(ctx, flags, status);
3267                 if (status == 0)
3268                         break;
3269                 /* NOTE: BAD_SEQID means the server and client disagree about the
3270                  * book-keeping w.r.t. state-changing operations
3271                  * (OPEN/CLOSE/LOCK/LOCKU...)
3272                  * It is actually a sign of a bug on the client or on the server.
3273                  *
3274                  * If we receive a BAD_SEQID error in the particular case of
3275                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3276                  * have unhashed the old state_owner for us, and that we can
3277                  * therefore safely retry using a new one. We should still warn
3278                  * the user though...
3279                  */
3280                 if (status == -NFS4ERR_BAD_SEQID) {
3281                         pr_warn_ratelimited("NFS: v4 server %s "
3282                                         " returned a bad sequence-id error!\n",
3283                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3284                         exception.retry = 1;
3285                         continue;
3286                 }
3287                 /*
3288                  * BAD_STATEID on OPEN means that the server cancelled our
3289                  * state before it received the OPEN_CONFIRM.
3290                  * Recover by retrying the request as per the discussion
3291                  * on Page 181 of RFC3530.
3292                  */
3293                 if (status == -NFS4ERR_BAD_STATEID) {
3294                         exception.retry = 1;
3295                         continue;
3296                 }
3297                 if (status == -NFS4ERR_EXPIRED) {
3298                         nfs4_schedule_lease_recovery(server->nfs_client);
3299                         exception.retry = 1;
3300                         continue;
3301                 }
3302                 if (status == -EAGAIN) {
3303                         /* We must have found a delegation */
3304                         exception.retry = 1;
3305                         continue;
3306                 }
3307                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3308                         continue;
3309                 res = ERR_PTR(nfs4_handle_exception(server,
3310                                         status, &exception));
3311         } while (exception.retry);
3312         return res;
3313 }
3314
3315 static int _nfs4_do_setattr(struct inode *inode,
3316                             struct nfs_setattrargs *arg,
3317                             struct nfs_setattrres *res,
3318                             const struct cred *cred,
3319                             struct nfs_open_context *ctx)
3320 {
3321         struct nfs_server *server = NFS_SERVER(inode);
3322         struct rpc_message msg = {
3323                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3324                 .rpc_argp       = arg,
3325                 .rpc_resp       = res,
3326                 .rpc_cred       = cred,
3327         };
3328         const struct cred *delegation_cred = NULL;
3329         unsigned long timestamp = jiffies;
3330         bool truncate;
3331         int status;
3332
3333         nfs_fattr_init(res->fattr);
3334
3335         /* Servers should only apply open mode checks for file size changes */
3336         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3337         if (!truncate) {
3338                 nfs4_inode_make_writeable(inode);
3339                 goto zero_stateid;
3340         }
3341
3342         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3343                 /* Use that stateid */
3344         } else if (ctx != NULL && ctx->state) {
3345                 struct nfs_lock_context *l_ctx;
3346                 if (!nfs4_valid_open_stateid(ctx->state))
3347                         return -EBADF;
3348                 l_ctx = nfs_get_lock_context(ctx);
3349                 if (IS_ERR(l_ctx))
3350                         return PTR_ERR(l_ctx);
3351                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3352                                                 &arg->stateid, &delegation_cred);
3353                 nfs_put_lock_context(l_ctx);
3354                 if (status == -EIO)
3355                         return -EBADF;
3356                 else if (status == -EAGAIN)
3357                         goto zero_stateid;
3358         } else {
3359 zero_stateid:
3360                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3361         }
3362         if (delegation_cred)
3363                 msg.rpc_cred = delegation_cred;
3364
3365         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3366
3367         put_cred(delegation_cred);
3368         if (status == 0 && ctx != NULL)
3369                 renew_lease(server, timestamp);
3370         trace_nfs4_setattr(inode, &arg->stateid, status);
3371         return status;
3372 }
3373
3374 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3375                            struct nfs_fattr *fattr, struct iattr *sattr,
3376                            struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3377 {
3378         struct nfs_server *server = NFS_SERVER(inode);
3379         __u32 bitmask[NFS4_BITMASK_SZ];
3380         struct nfs4_state *state = ctx ? ctx->state : NULL;
3381         struct nfs_setattrargs  arg = {
3382                 .fh             = NFS_FH(inode),
3383                 .iap            = sattr,
3384                 .server         = server,
3385                 .bitmask = bitmask,
3386                 .label          = ilabel,
3387         };
3388         struct nfs_setattrres  res = {
3389                 .fattr          = fattr,
3390                 .server         = server,
3391         };
3392         struct nfs4_exception exception = {
3393                 .state = state,
3394                 .inode = inode,
3395                 .stateid = &arg.stateid,
3396         };
3397         unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3398         int err;
3399
3400         if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3401                 adjust_flags |= NFS_INO_INVALID_MODE;
3402         if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3403                 adjust_flags |= NFS_INO_INVALID_OTHER;
3404
3405         do {
3406                 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3407                                         inode, adjust_flags);
3408
3409                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3410                 switch (err) {
3411                 case -NFS4ERR_OPENMODE:
3412                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3413                                 pr_warn_once("NFSv4: server %s is incorrectly "
3414                                                 "applying open mode checks to "
3415                                                 "a SETATTR that is not "
3416                                                 "changing file size.\n",
3417                                                 server->nfs_client->cl_hostname);
3418                         }
3419                         if (state && !(state->state & FMODE_WRITE)) {
3420                                 err = -EBADF;
3421                                 if (sattr->ia_valid & ATTR_OPEN)
3422                                         err = -EACCES;
3423                                 goto out;
3424                         }
3425                 }
3426                 err = nfs4_handle_exception(server, err, &exception);
3427         } while (exception.retry);
3428 out:
3429         return err;
3430 }
3431
3432 static bool
3433 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3434 {
3435         if (inode == NULL || !nfs_have_layout(inode))
3436                 return false;
3437
3438         return pnfs_wait_on_layoutreturn(inode, task);
3439 }
3440
3441 /*
3442  * Update the seqid of an open stateid
3443  */
3444 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3445                 struct nfs4_state *state)
3446 {
3447         __be32 seqid_open;
3448         u32 dst_seqid;
3449         int seq;
3450
3451         for (;;) {
3452                 if (!nfs4_valid_open_stateid(state))
3453                         break;
3454                 seq = read_seqbegin(&state->seqlock);
3455                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3456                         nfs4_stateid_copy(dst, &state->open_stateid);
3457                         if (read_seqretry(&state->seqlock, seq))
3458                                 continue;
3459                         break;
3460                 }
3461                 seqid_open = state->open_stateid.seqid;
3462                 if (read_seqretry(&state->seqlock, seq))
3463                         continue;
3464
3465                 dst_seqid = be32_to_cpu(dst->seqid);
3466                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3467                         dst->seqid = seqid_open;
3468                 break;
3469         }
3470 }
3471
3472 /*
3473  * Update the seqid of an open stateid after receiving
3474  * NFS4ERR_OLD_STATEID
3475  */
3476 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3477                 struct nfs4_state *state)
3478 {
3479         __be32 seqid_open;
3480         u32 dst_seqid;
3481         bool ret;
3482         int seq, status = -EAGAIN;
3483         DEFINE_WAIT(wait);
3484
3485         for (;;) {
3486                 ret = false;
3487                 if (!nfs4_valid_open_stateid(state))
3488                         break;
3489                 seq = read_seqbegin(&state->seqlock);
3490                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3491                         if (read_seqretry(&state->seqlock, seq))
3492                                 continue;
3493                         break;
3494                 }
3495
3496                 write_seqlock(&state->seqlock);
3497                 seqid_open = state->open_stateid.seqid;
3498
3499                 dst_seqid = be32_to_cpu(dst->seqid);
3500
3501                 /* Did another OPEN bump the state's seqid?  try again: */
3502                 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3503                         dst->seqid = seqid_open;
3504                         write_sequnlock(&state->seqlock);
3505                         ret = true;
3506                         break;
3507                 }
3508
3509                 /* server says we're behind but we haven't seen the update yet */
3510                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3511                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3512                 write_sequnlock(&state->seqlock);
3513                 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3514
3515                 if (fatal_signal_pending(current))
3516                         status = -EINTR;
3517                 else
3518                         if (schedule_timeout(5*HZ) != 0)
3519                                 status = 0;
3520
3521                 finish_wait(&state->waitq, &wait);
3522
3523                 if (!status)
3524                         continue;
3525                 if (status == -EINTR)
3526                         break;
3527
3528                 /* we slept the whole 5 seconds, we must have lost a seqid */
3529                 dst->seqid = cpu_to_be32(dst_seqid + 1);
3530                 ret = true;
3531                 break;
3532         }
3533
3534         return ret;
3535 }
3536
3537 struct nfs4_closedata {
3538         struct inode *inode;
3539         struct nfs4_state *state;
3540         struct nfs_closeargs arg;
3541         struct nfs_closeres res;
3542         struct {
3543                 struct nfs4_layoutreturn_args arg;
3544                 struct nfs4_layoutreturn_res res;
3545                 struct nfs4_xdr_opaque_data ld_private;
3546                 u32 roc_barrier;
3547                 bool roc;
3548         } lr;
3549         struct nfs_fattr fattr;
3550         unsigned long timestamp;
3551 };
3552
3553 static void nfs4_free_closedata(void *data)
3554 {
3555         struct nfs4_closedata *calldata = data;
3556         struct nfs4_state_owner *sp = calldata->state->owner;
3557         struct super_block *sb = calldata->state->inode->i_sb;
3558
3559         if (calldata->lr.roc)
3560                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3561                                 calldata->res.lr_ret);
3562         nfs4_put_open_state(calldata->state);
3563         nfs_free_seqid(calldata->arg.seqid);
3564         nfs4_put_state_owner(sp);
3565         nfs_sb_deactive(sb);
3566         kfree(calldata);
3567 }
3568
3569 static void nfs4_close_done(struct rpc_task *task, void *data)
3570 {
3571         struct nfs4_closedata *calldata = data;
3572         struct nfs4_state *state = calldata->state;
3573         struct nfs_server *server = NFS_SERVER(calldata->inode);
3574         nfs4_stateid *res_stateid = NULL;
3575         struct nfs4_exception exception = {
3576                 .state = state,
3577                 .inode = calldata->inode,
3578                 .stateid = &calldata->arg.stateid,
3579         };
3580
3581         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3582                 return;
3583         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3584
3585         /* Handle Layoutreturn errors */
3586         if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3587                           &calldata->res.lr_ret) == -EAGAIN)
3588                 goto out_restart;
3589
3590         /* hmm. we are done with the inode, and in the process of freeing
3591          * the state_owner. we keep this around to process errors
3592          */
3593         switch (task->tk_status) {
3594                 case 0:
3595                         res_stateid = &calldata->res.stateid;
3596                         renew_lease(server, calldata->timestamp);
3597                         break;
3598                 case -NFS4ERR_ACCESS:
3599                         if (calldata->arg.bitmask != NULL) {
3600                                 calldata->arg.bitmask = NULL;
3601                                 calldata->res.fattr = NULL;
3602                                 goto out_restart;
3603
3604                         }
3605                         break;
3606                 case -NFS4ERR_OLD_STATEID:
3607                         /* Did we race with OPEN? */
3608                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3609                                                 state))
3610                                 goto out_restart;
3611                         goto out_release;
3612                 case -NFS4ERR_ADMIN_REVOKED:
3613                 case -NFS4ERR_STALE_STATEID:
3614                 case -NFS4ERR_EXPIRED:
3615                         nfs4_free_revoked_stateid(server,
3616                                         &calldata->arg.stateid,
3617                                         task->tk_msg.rpc_cred);
3618                         fallthrough;
3619                 case -NFS4ERR_BAD_STATEID:
3620                         if (calldata->arg.fmode == 0)
3621                                 break;
3622                         fallthrough;
3623                 default:
3624                         task->tk_status = nfs4_async_handle_exception(task,
3625                                         server, task->tk_status, &exception);
3626                         if (exception.retry)
3627                                 goto out_restart;
3628         }
3629         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3630                         res_stateid, calldata->arg.fmode);
3631 out_release:
3632         task->tk_status = 0;
3633         nfs_release_seqid(calldata->arg.seqid);
3634         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3635         dprintk("%s: ret = %d\n", __func__, task->tk_status);
3636         return;
3637 out_restart:
3638         task->tk_status = 0;
3639         rpc_restart_call_prepare(task);
3640         goto out_release;
3641 }
3642
3643 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3644 {
3645         struct nfs4_closedata *calldata = data;
3646         struct nfs4_state *state = calldata->state;
3647         struct inode *inode = calldata->inode;
3648         struct nfs_server *server = NFS_SERVER(inode);
3649         struct pnfs_layout_hdr *lo;
3650         bool is_rdonly, is_wronly, is_rdwr;
3651         int call_close = 0;
3652
3653         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3654                 goto out_wait;
3655
3656         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3657         spin_lock(&state->owner->so_lock);
3658         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3659         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3660         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3661         /* Calculate the change in open mode */
3662         calldata->arg.fmode = 0;
3663         if (state->n_rdwr == 0) {
3664                 if (state->n_rdonly == 0)
3665                         call_close |= is_rdonly;
3666                 else if (is_rdonly)
3667                         calldata->arg.fmode |= FMODE_READ;
3668                 if (state->n_wronly == 0)
3669                         call_close |= is_wronly;
3670                 else if (is_wronly)
3671                         calldata->arg.fmode |= FMODE_WRITE;
3672                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3673                         call_close |= is_rdwr;
3674         } else if (is_rdwr)
3675                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3676
3677         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3678         if (!nfs4_valid_open_stateid(state))
3679                 call_close = 0;
3680         spin_unlock(&state->owner->so_lock);
3681
3682         if (!call_close) {
3683                 /* Note: exit _without_ calling nfs4_close_done */
3684                 goto out_no_action;
3685         }
3686
3687         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3688                 nfs_release_seqid(calldata->arg.seqid);
3689                 goto out_wait;
3690         }
3691
3692         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3693         if (lo && !pnfs_layout_is_valid(lo)) {
3694                 calldata->arg.lr_args = NULL;
3695                 calldata->res.lr_res = NULL;
3696         }
3697
3698         if (calldata->arg.fmode == 0)
3699                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3700
3701         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3702                 /* Close-to-open cache consistency revalidation */
3703                 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3704                         nfs4_bitmask_set(calldata->arg.bitmask_store,
3705                                          server->cache_consistency_bitmask,
3706                                          inode, 0);
3707                         calldata->arg.bitmask = calldata->arg.bitmask_store;
3708                 } else
3709                         calldata->arg.bitmask = NULL;
3710         }
3711
3712         calldata->arg.share_access =
3713                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3714                                 calldata->arg.fmode, 0);
3715
3716         if (calldata->res.fattr == NULL)
3717                 calldata->arg.bitmask = NULL;
3718         else if (calldata->arg.bitmask == NULL)
3719                 calldata->res.fattr = NULL;
3720         calldata->timestamp = jiffies;
3721         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3722                                 &calldata->arg.seq_args,
3723                                 &calldata->res.seq_res,
3724                                 task) != 0)
3725                 nfs_release_seqid(calldata->arg.seqid);
3726         return;
3727 out_no_action:
3728         task->tk_action = NULL;
3729 out_wait:
3730         nfs4_sequence_done(task, &calldata->res.seq_res);
3731 }
3732
3733 static const struct rpc_call_ops nfs4_close_ops = {
3734         .rpc_call_prepare = nfs4_close_prepare,
3735         .rpc_call_done = nfs4_close_done,
3736         .rpc_release = nfs4_free_closedata,
3737 };
3738
3739 /*
3740  * It is possible for data to be read/written from a mem-mapped file
3741  * after the sys_close call (which hits the vfs layer as a flush).
3742  * This means that we can't safely call nfsv4 close on a file until
3743  * the inode is cleared. This in turn means that we are not good
3744  * NFSv4 citizens - we do not indicate to the server to update the file's
3745  * share state even when we are done with one of the three share
3746  * stateid's in the inode.
3747  *
3748  * NOTE: Caller must be holding the sp->so_owner semaphore!
3749  */
3750 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3751 {
3752         struct nfs_server *server = NFS_SERVER(state->inode);
3753         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3754         struct nfs4_closedata *calldata;
3755         struct nfs4_state_owner *sp = state->owner;
3756         struct rpc_task *task;
3757         struct rpc_message msg = {
3758                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3759                 .rpc_cred = state->owner->so_cred,
3760         };
3761         struct rpc_task_setup task_setup_data = {
3762                 .rpc_client = server->client,
3763                 .rpc_message = &msg,
3764                 .callback_ops = &nfs4_close_ops,
3765                 .workqueue = nfsiod_workqueue,
3766                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3767         };
3768         int status = -ENOMEM;
3769
3770         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3771                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3772
3773         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3774                 &task_setup_data.rpc_client, &msg);
3775
3776         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3777         if (calldata == NULL)
3778                 goto out;
3779         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3780         calldata->inode = state->inode;
3781         calldata->state = state;
3782         calldata->arg.fh = NFS_FH(state->inode);
3783         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3784                 goto out_free_calldata;
3785         /* Serialization for the sequence id */
3786         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3787         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3788         if (IS_ERR(calldata->arg.seqid))
3789                 goto out_free_calldata;
3790         nfs_fattr_init(&calldata->fattr);
3791         calldata->arg.fmode = 0;
3792         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3793         calldata->res.fattr = &calldata->fattr;
3794         calldata->res.seqid = calldata->arg.seqid;
3795         calldata->res.server = server;
3796         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3797         calldata->lr.roc = pnfs_roc(state->inode,
3798                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3799         if (calldata->lr.roc) {
3800                 calldata->arg.lr_args = &calldata->lr.arg;
3801                 calldata->res.lr_res = &calldata->lr.res;
3802         }
3803         nfs_sb_active(calldata->inode->i_sb);
3804
3805         msg.rpc_argp = &calldata->arg;
3806         msg.rpc_resp = &calldata->res;
3807         task_setup_data.callback_data = calldata;
3808         task = rpc_run_task(&task_setup_data);
3809         if (IS_ERR(task))
3810                 return PTR_ERR(task);
3811         status = 0;
3812         if (wait)
3813                 status = rpc_wait_for_completion_task(task);
3814         rpc_put_task(task);
3815         return status;
3816 out_free_calldata:
3817         kfree(calldata);
3818 out:
3819         nfs4_put_open_state(state);
3820         nfs4_put_state_owner(sp);
3821         return status;
3822 }
3823
3824 static struct inode *
3825 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3826                 int open_flags, struct iattr *attr, int *opened)
3827 {
3828         struct nfs4_state *state;
3829         struct nfs4_label l, *label;
3830
3831         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3832
3833         /* Protect against concurrent sillydeletes */
3834         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3835
3836         nfs4_label_release_security(label);
3837
3838         if (IS_ERR(state))
3839                 return ERR_CAST(state);
3840         return state->inode;
3841 }
3842
3843 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3844 {
3845         if (ctx->state == NULL)
3846                 return;
3847         if (is_sync)
3848                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3849         else
3850                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3851 }
3852
3853 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3854 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3855 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3856
3857 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3858 {
3859         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3860         struct nfs4_server_caps_arg args = {
3861                 .fhandle = fhandle,
3862                 .bitmask = bitmask,
3863         };
3864         struct nfs4_server_caps_res res = {};
3865         struct rpc_message msg = {
3866                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3867                 .rpc_argp = &args,
3868                 .rpc_resp = &res,
3869         };
3870         int status;
3871         int i;
3872
3873         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3874                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3875                      FATTR4_WORD0_LINK_SUPPORT |
3876                      FATTR4_WORD0_SYMLINK_SUPPORT |
3877                      FATTR4_WORD0_ACLSUPPORT |
3878                      FATTR4_WORD0_CASE_INSENSITIVE |
3879                      FATTR4_WORD0_CASE_PRESERVING;
3880         if (minorversion)
3881                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3882
3883         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3884         if (status == 0) {
3885                 /* Sanity check the server answers */
3886                 switch (minorversion) {
3887                 case 0:
3888                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3889                         res.attr_bitmask[2] = 0;
3890                         break;
3891                 case 1:
3892                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3893                         break;
3894                 case 2:
3895                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3896                 }
3897                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3898                 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3899                                   NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3900                 server->fattr_valid = NFS_ATTR_FATTR_V4;
3901                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3902                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3903                         server->caps |= NFS_CAP_ACLS;
3904                 if (res.has_links != 0)
3905                         server->caps |= NFS_CAP_HARDLINKS;
3906                 if (res.has_symlinks != 0)
3907                         server->caps |= NFS_CAP_SYMLINKS;
3908                 if (res.case_insensitive)
3909                         server->caps |= NFS_CAP_CASE_INSENSITIVE;
3910                 if (res.case_preserving)
3911                         server->caps |= NFS_CAP_CASE_PRESERVING;
3912 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3913                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3914                         server->caps |= NFS_CAP_SECURITY_LABEL;
3915 #endif
3916                 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3917                         server->caps |= NFS_CAP_FS_LOCATIONS;
3918                 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3919                         server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3920                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3921                         server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3922                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3923                         server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3924                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3925                         server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3926                                 NFS_ATTR_FATTR_OWNER_NAME);
3927                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3928                         server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3929                                 NFS_ATTR_FATTR_GROUP_NAME);
3930                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3931                         server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3932                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3933                         server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3934                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3935                         server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3936                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3937                         server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3938                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3939                                 sizeof(server->attr_bitmask));
3940                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3941
3942                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3943                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3944                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3945                 server->cache_consistency_bitmask[2] = 0;
3946
3947                 /* Avoid a regression due to buggy server */
3948                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3949                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3950                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3951                         sizeof(server->exclcreat_bitmask));
3952
3953                 server->acl_bitmask = res.acl_bitmask;
3954                 server->fh_expire_type = res.fh_expire_type;
3955         }
3956
3957         return status;
3958 }
3959
3960 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3961 {
3962         struct nfs4_exception exception = {
3963                 .interruptible = true,
3964         };
3965         int err;
3966
3967         nfs4_server_set_init_caps(server);
3968         do {
3969                 err = nfs4_handle_exception(server,
3970                                 _nfs4_server_capabilities(server, fhandle),
3971                                 &exception);
3972         } while (exception.retry);
3973         return err;
3974 }
3975
3976 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3977                                           struct nfs_client *clp,
3978                                           struct nfs_server *server)
3979 {
3980         int i;
3981
3982         for (i = 0; i < location->nservers; i++) {
3983                 struct nfs4_string *srv_loc = &location->servers[i];
3984                 struct sockaddr_storage addr;
3985                 size_t addrlen;
3986                 struct xprt_create xprt_args = {
3987                         .ident = 0,
3988                         .net = clp->cl_net,
3989                 };
3990                 struct nfs4_add_xprt_data xprtdata = {
3991                         .clp = clp,
3992                 };
3993                 struct rpc_add_xprt_test rpcdata = {
3994                         .add_xprt_test = clp->cl_mvops->session_trunk,
3995                         .data = &xprtdata,
3996                 };
3997                 char *servername = NULL;
3998
3999                 if (!srv_loc->len)
4000                         continue;
4001
4002                 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
4003                                                 &addr, sizeof(addr),
4004                                                 clp->cl_net, server->port);
4005                 if (!addrlen)
4006                         return;
4007                 xprt_args.dstaddr = (struct sockaddr *)&addr;
4008                 xprt_args.addrlen = addrlen;
4009                 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
4010                 if (!servername)
4011                         return;
4012                 memcpy(servername, srv_loc->data, srv_loc->len);
4013                 servername[srv_loc->len] = '\0';
4014                 xprt_args.servername = servername;
4015
4016                 xprtdata.cred = nfs4_get_clid_cred(clp);
4017                 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
4018                                   rpc_clnt_setup_test_and_add_xprt,
4019                                   &rpcdata);
4020                 if (xprtdata.cred)
4021                         put_cred(xprtdata.cred);
4022                 kfree(servername);
4023         }
4024 }
4025
4026 static int _nfs4_discover_trunking(struct nfs_server *server,
4027                                    struct nfs_fh *fhandle)
4028 {
4029         struct nfs4_fs_locations *locations = NULL;
4030         struct page *page;
4031         const struct cred *cred;
4032         struct nfs_client *clp = server->nfs_client;
4033         const struct nfs4_state_maintenance_ops *ops =
4034                 clp->cl_mvops->state_renewal_ops;
4035         int status = -ENOMEM, i;
4036
4037         cred = ops->get_state_renewal_cred(clp);
4038         if (cred == NULL) {
4039                 cred = nfs4_get_clid_cred(clp);
4040                 if (cred == NULL)
4041                         return -ENOKEY;
4042         }
4043
4044         page = alloc_page(GFP_KERNEL);
4045         if (!page)
4046                 goto out_put_cred;
4047         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4048         if (!locations)
4049                 goto out_free;
4050         locations->fattr = nfs_alloc_fattr();
4051         if (!locations->fattr)
4052                 goto out_free_2;
4053
4054         status = nfs4_proc_get_locations(server, fhandle, locations, page,
4055                                          cred);
4056         if (status)
4057                 goto out_free_3;
4058
4059         for (i = 0; i < locations->nlocations; i++)
4060                 test_fs_location_for_trunking(&locations->locations[i], clp,
4061                                               server);
4062 out_free_3:
4063         kfree(locations->fattr);
4064 out_free_2:
4065         kfree(locations);
4066 out_free:
4067         __free_page(page);
4068 out_put_cred:
4069         put_cred(cred);
4070         return status;
4071 }
4072
4073 static int nfs4_discover_trunking(struct nfs_server *server,
4074                                   struct nfs_fh *fhandle)
4075 {
4076         struct nfs4_exception exception = {
4077                 .interruptible = true,
4078         };
4079         struct nfs_client *clp = server->nfs_client;
4080         int err = 0;
4081
4082         if (!nfs4_has_session(clp))
4083                 goto out;
4084         do {
4085                 err = nfs4_handle_exception(server,
4086                                 _nfs4_discover_trunking(server, fhandle),
4087                                 &exception);
4088         } while (exception.retry);
4089 out:
4090         return err;
4091 }
4092
4093 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4094                 struct nfs_fsinfo *info)
4095 {
4096         u32 bitmask[3];
4097         struct nfs4_lookup_root_arg args = {
4098                 .bitmask = bitmask,
4099         };
4100         struct nfs4_lookup_res res = {
4101                 .server = server,
4102                 .fattr = info->fattr,
4103                 .fh = fhandle,
4104         };
4105         struct rpc_message msg = {
4106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4107                 .rpc_argp = &args,
4108                 .rpc_resp = &res,
4109         };
4110
4111         bitmask[0] = nfs4_fattr_bitmap[0];
4112         bitmask[1] = nfs4_fattr_bitmap[1];
4113         /*
4114          * Process the label in the upcoming getfattr
4115          */
4116         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4117
4118         nfs_fattr_init(info->fattr);
4119         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4120 }
4121
4122 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4123                 struct nfs_fsinfo *info)
4124 {
4125         struct nfs4_exception exception = {
4126                 .interruptible = true,
4127         };
4128         int err;
4129         do {
4130                 err = _nfs4_lookup_root(server, fhandle, info);
4131                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4132                 switch (err) {
4133                 case 0:
4134                 case -NFS4ERR_WRONGSEC:
4135                         goto out;
4136                 default:
4137                         err = nfs4_handle_exception(server, err, &exception);
4138                 }
4139         } while (exception.retry);
4140 out:
4141         return err;
4142 }
4143
4144 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4145                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4146 {
4147         struct rpc_auth_create_args auth_args = {
4148                 .pseudoflavor = flavor,
4149         };
4150         struct rpc_auth *auth;
4151
4152         auth = rpcauth_create(&auth_args, server->client);
4153         if (IS_ERR(auth))
4154                 return -EACCES;
4155         return nfs4_lookup_root(server, fhandle, info);
4156 }
4157
4158 /*
4159  * Retry pseudoroot lookup with various security flavors.  We do this when:
4160  *
4161  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4162  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4163  *
4164  * Returns zero on success, or a negative NFS4ERR value, or a
4165  * negative errno value.
4166  */
4167 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4168                               struct nfs_fsinfo *info)
4169 {
4170         /* Per 3530bis 15.33.5 */
4171         static const rpc_authflavor_t flav_array[] = {
4172                 RPC_AUTH_GSS_KRB5P,
4173                 RPC_AUTH_GSS_KRB5I,
4174                 RPC_AUTH_GSS_KRB5,
4175                 RPC_AUTH_UNIX,                  /* courtesy */
4176                 RPC_AUTH_NULL,
4177         };
4178         int status = -EPERM;
4179         size_t i;
4180
4181         if (server->auth_info.flavor_len > 0) {
4182                 /* try each flavor specified by user */
4183                 for (i = 0; i < server->auth_info.flavor_len; i++) {
4184                         status = nfs4_lookup_root_sec(server, fhandle, info,
4185                                                 server->auth_info.flavors[i]);
4186                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4187                                 continue;
4188                         break;
4189                 }
4190         } else {
4191                 /* no flavors specified by user, try default list */
4192                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4193                         status = nfs4_lookup_root_sec(server, fhandle, info,
4194                                                       flav_array[i]);
4195                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4196                                 continue;
4197                         break;
4198                 }
4199         }
4200
4201         /*
4202          * -EACCES could mean that the user doesn't have correct permissions
4203          * to access the mount.  It could also mean that we tried to mount
4204          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4205          * existing mount programs don't handle -EACCES very well so it should
4206          * be mapped to -EPERM instead.
4207          */
4208         if (status == -EACCES)
4209                 status = -EPERM;
4210         return status;
4211 }
4212
4213 /**
4214  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4215  * @server: initialized nfs_server handle
4216  * @fhandle: we fill in the pseudo-fs root file handle
4217  * @info: we fill in an FSINFO struct
4218  * @auth_probe: probe the auth flavours
4219  *
4220  * Returns zero on success, or a negative errno.
4221  */
4222 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4223                          struct nfs_fsinfo *info,
4224                          bool auth_probe)
4225 {
4226         int status = 0;
4227
4228         if (!auth_probe)
4229                 status = nfs4_lookup_root(server, fhandle, info);
4230
4231         if (auth_probe || status == NFS4ERR_WRONGSEC)
4232                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4233                                 fhandle, info);
4234
4235         if (status == 0)
4236                 status = nfs4_server_capabilities(server, fhandle);
4237         if (status == 0)
4238                 status = nfs4_do_fsinfo(server, fhandle, info);
4239
4240         return nfs4_map_errors(status);
4241 }
4242
4243 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4244                               struct nfs_fsinfo *info)
4245 {
4246         int error;
4247         struct nfs_fattr *fattr = info->fattr;
4248
4249         error = nfs4_server_capabilities(server, mntfh);
4250         if (error < 0) {
4251                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4252                 return error;
4253         }
4254
4255         error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4256         if (error < 0) {
4257                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4258                 goto out;
4259         }
4260
4261         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4262             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4263                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4264
4265 out:
4266         return error;
4267 }
4268
4269 /*
4270  * Get locations and (maybe) other attributes of a referral.
4271  * Note that we'll actually follow the referral later when
4272  * we detect fsid mismatch in inode revalidation
4273  */
4274 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4275                              const struct qstr *name, struct nfs_fattr *fattr,
4276                              struct nfs_fh *fhandle)
4277 {
4278         int status = -ENOMEM;
4279         struct page *page = NULL;
4280         struct nfs4_fs_locations *locations = NULL;
4281
4282         page = alloc_page(GFP_KERNEL);
4283         if (page == NULL)
4284                 goto out;
4285         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4286         if (locations == NULL)
4287                 goto out;
4288
4289         locations->fattr = fattr;
4290
4291         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4292         if (status != 0)
4293                 goto out;
4294
4295         /*
4296          * If the fsid didn't change, this is a migration event, not a
4297          * referral.  Cause us to drop into the exception handler, which
4298          * will kick off migration recovery.
4299          */
4300         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4301                 dprintk("%s: server did not return a different fsid for"
4302                         " a referral at %s\n", __func__, name->name);
4303                 status = -NFS4ERR_MOVED;
4304                 goto out;
4305         }
4306         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4307         nfs_fixup_referral_attributes(fattr);
4308         memset(fhandle, 0, sizeof(struct nfs_fh));
4309 out:
4310         if (page)
4311                 __free_page(page);
4312         kfree(locations);
4313         return status;
4314 }
4315
4316 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4317                                 struct nfs_fattr *fattr, struct inode *inode)
4318 {
4319         __u32 bitmask[NFS4_BITMASK_SZ];
4320         struct nfs4_getattr_arg args = {
4321                 .fh = fhandle,
4322                 .bitmask = bitmask,
4323         };
4324         struct nfs4_getattr_res res = {
4325                 .fattr = fattr,
4326                 .server = server,
4327         };
4328         struct rpc_message msg = {
4329                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4330                 .rpc_argp = &args,
4331                 .rpc_resp = &res,
4332         };
4333         unsigned short task_flags = 0;
4334
4335         if (nfs4_has_session(server->nfs_client))
4336                 task_flags = RPC_TASK_MOVEABLE;
4337
4338         /* Is this is an attribute revalidation, subject to softreval? */
4339         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4340                 task_flags |= RPC_TASK_TIMEOUT;
4341
4342         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4343         nfs_fattr_init(fattr);
4344         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4345         return nfs4_do_call_sync(server->client, server, &msg,
4346                         &args.seq_args, &res.seq_res, task_flags);
4347 }
4348
4349 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4350                                 struct nfs_fattr *fattr, struct inode *inode)
4351 {
4352         struct nfs4_exception exception = {
4353                 .interruptible = true,
4354         };
4355         int err;
4356         do {
4357                 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4358                 trace_nfs4_getattr(server, fhandle, fattr, err);
4359                 err = nfs4_handle_exception(server, err,
4360                                 &exception);
4361         } while (exception.retry);
4362         return err;
4363 }
4364
4365 /*
4366  * The file is not closed if it is opened due to the a request to change
4367  * the size of the file. The open call will not be needed once the
4368  * VFS layer lookup-intents are implemented.
4369  *
4370  * Close is called when the inode is destroyed.
4371  * If we haven't opened the file for O_WRONLY, we
4372  * need to in the size_change case to obtain a stateid.
4373  *
4374  * Got race?
4375  * Because OPEN is always done by name in nfsv4, it is
4376  * possible that we opened a different file by the same
4377  * name.  We can recognize this race condition, but we
4378  * can't do anything about it besides returning an error.
4379  *
4380  * This will be fixed with VFS changes (lookup-intent).
4381  */
4382 static int
4383 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4384                   struct iattr *sattr)
4385 {
4386         struct inode *inode = d_inode(dentry);
4387         const struct cred *cred = NULL;
4388         struct nfs_open_context *ctx = NULL;
4389         int status;
4390
4391         if (pnfs_ld_layoutret_on_setattr(inode) &&
4392             sattr->ia_valid & ATTR_SIZE &&
4393             sattr->ia_size < i_size_read(inode))
4394                 pnfs_commit_and_return_layout(inode);
4395
4396         nfs_fattr_init(fattr);
4397
4398         /* Deal with open(O_TRUNC) */
4399         if (sattr->ia_valid & ATTR_OPEN)
4400                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4401
4402         /* Optimization: if the end result is no change, don't RPC */
4403         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4404                 return 0;
4405
4406         /* Search for an existing open(O_WRITE) file */
4407         if (sattr->ia_valid & ATTR_FILE) {
4408
4409                 ctx = nfs_file_open_context(sattr->ia_file);
4410                 if (ctx)
4411                         cred = ctx->cred;
4412         }
4413
4414         /* Return any delegations if we're going to change ACLs */
4415         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4416                 nfs4_inode_make_writeable(inode);
4417
4418         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4419         if (status == 0) {
4420                 nfs_setattr_update_inode(inode, sattr, fattr);
4421                 nfs_setsecurity(inode, fattr);
4422         }
4423         return status;
4424 }
4425
4426 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4427                 struct dentry *dentry, struct nfs_fh *fhandle,
4428                 struct nfs_fattr *fattr)
4429 {
4430         struct nfs_server *server = NFS_SERVER(dir);
4431         int                    status;
4432         struct nfs4_lookup_arg args = {
4433                 .bitmask = server->attr_bitmask,
4434                 .dir_fh = NFS_FH(dir),
4435                 .name = &dentry->d_name,
4436         };
4437         struct nfs4_lookup_res res = {
4438                 .server = server,
4439                 .fattr = fattr,
4440                 .fh = fhandle,
4441         };
4442         struct rpc_message msg = {
4443                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4444                 .rpc_argp = &args,
4445                 .rpc_resp = &res,
4446         };
4447         unsigned short task_flags = 0;
4448
4449         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4450                 task_flags = RPC_TASK_MOVEABLE;
4451
4452         /* Is this is an attribute revalidation, subject to softreval? */
4453         if (nfs_lookup_is_soft_revalidate(dentry))
4454                 task_flags |= RPC_TASK_TIMEOUT;
4455
4456         args.bitmask = nfs4_bitmask(server, fattr->label);
4457
4458         nfs_fattr_init(fattr);
4459
4460         dprintk("NFS call  lookup %pd2\n", dentry);
4461         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4462         status = nfs4_do_call_sync(clnt, server, &msg,
4463                         &args.seq_args, &res.seq_res, task_flags);
4464         dprintk("NFS reply lookup: %d\n", status);
4465         return status;
4466 }
4467
4468 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4469 {
4470         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4471                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4472         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4473         fattr->nlink = 2;
4474 }
4475
4476 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4477                                    struct dentry *dentry, struct nfs_fh *fhandle,
4478                                    struct nfs_fattr *fattr)
4479 {
4480         struct nfs4_exception exception = {
4481                 .interruptible = true,
4482         };
4483         struct rpc_clnt *client = *clnt;
4484         const struct qstr *name = &dentry->d_name;
4485         int err;
4486         do {
4487                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4488                 trace_nfs4_lookup(dir, name, err);
4489                 switch (err) {
4490                 case -NFS4ERR_BADNAME:
4491                         err = -ENOENT;
4492                         goto out;
4493                 case -NFS4ERR_MOVED:
4494                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4495                         if (err == -NFS4ERR_MOVED)
4496                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4497                         goto out;
4498                 case -NFS4ERR_WRONGSEC:
4499                         err = -EPERM;
4500                         if (client != *clnt)
4501                                 goto out;
4502                         client = nfs4_negotiate_security(client, dir, name);
4503                         if (IS_ERR(client))
4504                                 return PTR_ERR(client);
4505
4506                         exception.retry = 1;
4507                         break;
4508                 default:
4509                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4510                 }
4511         } while (exception.retry);
4512
4513 out:
4514         if (err == 0)
4515                 *clnt = client;
4516         else if (client != *clnt)
4517                 rpc_shutdown_client(client);
4518
4519         return err;
4520 }
4521
4522 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4523                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4524 {
4525         int status;
4526         struct rpc_clnt *client = NFS_CLIENT(dir);
4527
4528         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4529         if (client != NFS_CLIENT(dir)) {
4530                 rpc_shutdown_client(client);
4531                 nfs_fixup_secinfo_attributes(fattr);
4532         }
4533         return status;
4534 }
4535
4536 struct rpc_clnt *
4537 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4538                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4539 {
4540         struct rpc_clnt *client = NFS_CLIENT(dir);
4541         int status;
4542
4543         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4544         if (status < 0)
4545                 return ERR_PTR(status);
4546         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4547 }
4548
4549 static int _nfs4_proc_lookupp(struct inode *inode,
4550                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4551 {
4552         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4553         struct nfs_server *server = NFS_SERVER(inode);
4554         int                    status;
4555         struct nfs4_lookupp_arg args = {
4556                 .bitmask = server->attr_bitmask,
4557                 .fh = NFS_FH(inode),
4558         };
4559         struct nfs4_lookupp_res res = {
4560                 .server = server,
4561                 .fattr = fattr,
4562                 .fh = fhandle,
4563         };
4564         struct rpc_message msg = {
4565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4566                 .rpc_argp = &args,
4567                 .rpc_resp = &res,
4568         };
4569         unsigned short task_flags = 0;
4570
4571         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4572                 task_flags |= RPC_TASK_TIMEOUT;
4573
4574         args.bitmask = nfs4_bitmask(server, fattr->label);
4575
4576         nfs_fattr_init(fattr);
4577
4578         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4579         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4580                                 &res.seq_res, task_flags);
4581         dprintk("NFS reply lookupp: %d\n", status);
4582         return status;
4583 }
4584
4585 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4586                              struct nfs_fattr *fattr)
4587 {
4588         struct nfs4_exception exception = {
4589                 .interruptible = true,
4590         };
4591         int err;
4592         do {
4593                 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4594                 trace_nfs4_lookupp(inode, err);
4595                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4596                                 &exception);
4597         } while (exception.retry);
4598         return err;
4599 }
4600
4601 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4602                              const struct cred *cred)
4603 {
4604         struct nfs_server *server = NFS_SERVER(inode);
4605         struct nfs4_accessargs args = {
4606                 .fh = NFS_FH(inode),
4607                 .access = entry->mask,
4608         };
4609         struct nfs4_accessres res = {
4610                 .server = server,
4611         };
4612         struct rpc_message msg = {
4613                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4614                 .rpc_argp = &args,
4615                 .rpc_resp = &res,
4616                 .rpc_cred = cred,
4617         };
4618         int status = 0;
4619
4620         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4621                 res.fattr = nfs_alloc_fattr();
4622                 if (res.fattr == NULL)
4623                         return -ENOMEM;
4624                 args.bitmask = server->cache_consistency_bitmask;
4625         }
4626         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4627         if (!status) {
4628                 nfs_access_set_mask(entry, res.access);
4629                 if (res.fattr)
4630                         nfs_refresh_inode(inode, res.fattr);
4631         }
4632         nfs_free_fattr(res.fattr);
4633         return status;
4634 }
4635
4636 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4637                             const struct cred *cred)
4638 {
4639         struct nfs4_exception exception = {
4640                 .interruptible = true,
4641         };
4642         int err;
4643         do {
4644                 err = _nfs4_proc_access(inode, entry, cred);
4645                 trace_nfs4_access(inode, err);
4646                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4647                                 &exception);
4648         } while (exception.retry);
4649         return err;
4650 }
4651
4652 /*
4653  * TODO: For the time being, we don't try to get any attributes
4654  * along with any of the zero-copy operations READ, READDIR,
4655  * READLINK, WRITE.
4656  *
4657  * In the case of the first three, we want to put the GETATTR
4658  * after the read-type operation -- this is because it is hard
4659  * to predict the length of a GETATTR response in v4, and thus
4660  * align the READ data correctly.  This means that the GETATTR
4661  * may end up partially falling into the page cache, and we should
4662  * shift it into the 'tail' of the xdr_buf before processing.
4663  * To do this efficiently, we need to know the total length
4664  * of data received, which doesn't seem to be available outside
4665  * of the RPC layer.
4666  *
4667  * In the case of WRITE, we also want to put the GETATTR after
4668  * the operation -- in this case because we want to make sure
4669  * we get the post-operation mtime and size.
4670  *
4671  * Both of these changes to the XDR layer would in fact be quite
4672  * minor, but I decided to leave them for a subsequent patch.
4673  */
4674 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4675                 unsigned int pgbase, unsigned int pglen)
4676 {
4677         struct nfs4_readlink args = {
4678                 .fh       = NFS_FH(inode),
4679                 .pgbase   = pgbase,
4680                 .pglen    = pglen,
4681                 .pages    = &page,
4682         };
4683         struct nfs4_readlink_res res;
4684         struct rpc_message msg = {
4685                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4686                 .rpc_argp = &args,
4687                 .rpc_resp = &res,
4688         };
4689
4690         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4691 }
4692
4693 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4694                 unsigned int pgbase, unsigned int pglen)
4695 {
4696         struct nfs4_exception exception = {
4697                 .interruptible = true,
4698         };
4699         int err;
4700         do {
4701                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4702                 trace_nfs4_readlink(inode, err);
4703                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4704                                 &exception);
4705         } while (exception.retry);
4706         return err;
4707 }
4708
4709 /*
4710  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4711  */
4712 static int
4713 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4714                  int flags)
4715 {
4716         struct nfs_server *server = NFS_SERVER(dir);
4717         struct nfs4_label l, *ilabel;
4718         struct nfs_open_context *ctx;
4719         struct nfs4_state *state;
4720         int status = 0;
4721
4722         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4723         if (IS_ERR(ctx))
4724                 return PTR_ERR(ctx);
4725
4726         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4727
4728         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4729                 sattr->ia_mode &= ~current_umask();
4730         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4731         if (IS_ERR(state)) {
4732                 status = PTR_ERR(state);
4733                 goto out;
4734         }
4735 out:
4736         nfs4_label_release_security(ilabel);
4737         put_nfs_open_context(ctx);
4738         return status;
4739 }
4740
4741 static int
4742 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4743 {
4744         struct nfs_server *server = NFS_SERVER(dir);
4745         struct nfs_removeargs args = {
4746                 .fh = NFS_FH(dir),
4747                 .name = *name,
4748         };
4749         struct nfs_removeres res = {
4750                 .server = server,
4751         };
4752         struct rpc_message msg = {
4753                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4754                 .rpc_argp = &args,
4755                 .rpc_resp = &res,
4756         };
4757         unsigned long timestamp = jiffies;
4758         int status;
4759
4760         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4761         if (status == 0) {
4762                 spin_lock(&dir->i_lock);
4763                 /* Removing a directory decrements nlink in the parent */
4764                 if (ftype == NF4DIR && dir->i_nlink > 2)
4765                         nfs4_dec_nlink_locked(dir);
4766                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4767                                               NFS_INO_INVALID_DATA);
4768                 spin_unlock(&dir->i_lock);
4769         }
4770         return status;
4771 }
4772
4773 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4774 {
4775         struct nfs4_exception exception = {
4776                 .interruptible = true,
4777         };
4778         struct inode *inode = d_inode(dentry);
4779         int err;
4780
4781         if (inode) {
4782                 if (inode->i_nlink == 1)
4783                         nfs4_inode_return_delegation(inode);
4784                 else
4785                         nfs4_inode_make_writeable(inode);
4786         }
4787         do {
4788                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4789                 trace_nfs4_remove(dir, &dentry->d_name, err);
4790                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4791                                 &exception);
4792         } while (exception.retry);
4793         return err;
4794 }
4795
4796 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4797 {
4798         struct nfs4_exception exception = {
4799                 .interruptible = true,
4800         };
4801         int err;
4802
4803         do {
4804                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4805                 trace_nfs4_remove(dir, name, err);
4806                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4807                                 &exception);
4808         } while (exception.retry);
4809         return err;
4810 }
4811
4812 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4813                 struct dentry *dentry,
4814                 struct inode *inode)
4815 {
4816         struct nfs_removeargs *args = msg->rpc_argp;
4817         struct nfs_removeres *res = msg->rpc_resp;
4818
4819         res->server = NFS_SB(dentry->d_sb);
4820         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4821         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4822
4823         nfs_fattr_init(res->dir_attr);
4824
4825         if (inode) {
4826                 nfs4_inode_return_delegation(inode);
4827                 nfs_d_prune_case_insensitive_aliases(inode);
4828         }
4829 }
4830
4831 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4832 {
4833         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4834                         &data->args.seq_args,
4835                         &data->res.seq_res,
4836                         task);
4837 }
4838
4839 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4840 {
4841         struct nfs_unlinkdata *data = task->tk_calldata;
4842         struct nfs_removeres *res = &data->res;
4843
4844         if (!nfs4_sequence_done(task, &res->seq_res))
4845                 return 0;
4846         if (nfs4_async_handle_error(task, res->server, NULL,
4847                                     &data->timeout) == -EAGAIN)
4848                 return 0;
4849         if (task->tk_status == 0)
4850                 nfs4_update_changeattr(dir, &res->cinfo,
4851                                 res->dir_attr->time_start,
4852                                 NFS_INO_INVALID_DATA);
4853         return 1;
4854 }
4855
4856 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4857                 struct dentry *old_dentry,
4858                 struct dentry *new_dentry)
4859 {
4860         struct nfs_renameargs *arg = msg->rpc_argp;
4861         struct nfs_renameres *res = msg->rpc_resp;
4862         struct inode *old_inode = d_inode(old_dentry);
4863         struct inode *new_inode = d_inode(new_dentry);
4864
4865         if (old_inode)
4866                 nfs4_inode_make_writeable(old_inode);
4867         if (new_inode)
4868                 nfs4_inode_return_delegation(new_inode);
4869         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4870         res->server = NFS_SB(old_dentry->d_sb);
4871         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4872 }
4873
4874 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4875 {
4876         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4877                         &data->args.seq_args,
4878                         &data->res.seq_res,
4879                         task);
4880 }
4881
4882 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4883                                  struct inode *new_dir)
4884 {
4885         struct nfs_renamedata *data = task->tk_calldata;
4886         struct nfs_renameres *res = &data->res;
4887
4888         if (!nfs4_sequence_done(task, &res->seq_res))
4889                 return 0;
4890         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4891                 return 0;
4892
4893         if (task->tk_status == 0) {
4894                 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4895                 if (new_dir != old_dir) {
4896                         /* Note: If we moved a directory, nlink will change */
4897                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4898                                         res->old_fattr->time_start,
4899                                         NFS_INO_INVALID_NLINK |
4900                                             NFS_INO_INVALID_DATA);
4901                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4902                                         res->new_fattr->time_start,
4903                                         NFS_INO_INVALID_NLINK |
4904                                             NFS_INO_INVALID_DATA);
4905                 } else
4906                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4907                                         res->old_fattr->time_start,
4908                                         NFS_INO_INVALID_DATA);
4909         }
4910         return 1;
4911 }
4912
4913 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4914 {
4915         struct nfs_server *server = NFS_SERVER(inode);
4916         __u32 bitmask[NFS4_BITMASK_SZ];
4917         struct nfs4_link_arg arg = {
4918                 .fh     = NFS_FH(inode),
4919                 .dir_fh = NFS_FH(dir),
4920                 .name   = name,
4921                 .bitmask = bitmask,
4922         };
4923         struct nfs4_link_res res = {
4924                 .server = server,
4925         };
4926         struct rpc_message msg = {
4927                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4928                 .rpc_argp = &arg,
4929                 .rpc_resp = &res,
4930         };
4931         int status = -ENOMEM;
4932
4933         res.fattr = nfs_alloc_fattr_with_label(server);
4934         if (res.fattr == NULL)
4935                 goto out;
4936
4937         nfs4_inode_make_writeable(inode);
4938         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4939                                 NFS_INO_INVALID_CHANGE);
4940         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4941         if (!status) {
4942                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4943                                        NFS_INO_INVALID_DATA);
4944                 nfs4_inc_nlink(inode);
4945                 status = nfs_post_op_update_inode(inode, res.fattr);
4946                 if (!status)
4947                         nfs_setsecurity(inode, res.fattr);
4948         }
4949
4950 out:
4951         nfs_free_fattr(res.fattr);
4952         return status;
4953 }
4954
4955 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4956 {
4957         struct nfs4_exception exception = {
4958                 .interruptible = true,
4959         };
4960         int err;
4961         do {
4962                 err = nfs4_handle_exception(NFS_SERVER(inode),
4963                                 _nfs4_proc_link(inode, dir, name),
4964                                 &exception);
4965         } while (exception.retry);
4966         return err;
4967 }
4968
4969 struct nfs4_createdata {
4970         struct rpc_message msg;
4971         struct nfs4_create_arg arg;
4972         struct nfs4_create_res res;
4973         struct nfs_fh fh;
4974         struct nfs_fattr fattr;
4975 };
4976
4977 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4978                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4979 {
4980         struct nfs4_createdata *data;
4981
4982         data = kzalloc(sizeof(*data), GFP_KERNEL);
4983         if (data != NULL) {
4984                 struct nfs_server *server = NFS_SERVER(dir);
4985
4986                 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
4987                 if (IS_ERR(data->fattr.label))
4988                         goto out_free;
4989
4990                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4991                 data->msg.rpc_argp = &data->arg;
4992                 data->msg.rpc_resp = &data->res;
4993                 data->arg.dir_fh = NFS_FH(dir);
4994                 data->arg.server = server;
4995                 data->arg.name = name;
4996                 data->arg.attrs = sattr;
4997                 data->arg.ftype = ftype;
4998                 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
4999                 data->arg.umask = current_umask();
5000                 data->res.server = server;
5001                 data->res.fh = &data->fh;
5002                 data->res.fattr = &data->fattr;
5003                 nfs_fattr_init(data->res.fattr);
5004         }
5005         return data;
5006 out_free:
5007         kfree(data);
5008         return NULL;
5009 }
5010
5011 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
5012 {
5013         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5014                                     &data->arg.seq_args, &data->res.seq_res, 1);
5015         if (status == 0) {
5016                 spin_lock(&dir->i_lock);
5017                 /* Creating a directory bumps nlink in the parent */
5018                 if (data->arg.ftype == NF4DIR)
5019                         nfs4_inc_nlink_locked(dir);
5020                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5021                                               data->res.fattr->time_start,
5022                                               NFS_INO_INVALID_DATA);
5023                 spin_unlock(&dir->i_lock);
5024                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5025         }
5026         return status;
5027 }
5028
5029 static void nfs4_free_createdata(struct nfs4_createdata *data)
5030 {
5031         nfs4_label_free(data->fattr.label);
5032         kfree(data);
5033 }
5034
5035 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5036                 struct folio *folio, unsigned int len, struct iattr *sattr,
5037                 struct nfs4_label *label)
5038 {
5039         struct page *page = &folio->page;
5040         struct nfs4_createdata *data;
5041         int status = -ENAMETOOLONG;
5042
5043         if (len > NFS4_MAXPATHLEN)
5044                 goto out;
5045
5046         status = -ENOMEM;
5047         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5048         if (data == NULL)
5049                 goto out;
5050
5051         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5052         data->arg.u.symlink.pages = &page;
5053         data->arg.u.symlink.len = len;
5054         data->arg.label = label;
5055
5056         status = nfs4_do_create(dir, dentry, data);
5057
5058         nfs4_free_createdata(data);
5059 out:
5060         return status;
5061 }
5062
5063 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5064                 struct folio *folio, unsigned int len, struct iattr *sattr)
5065 {
5066         struct nfs4_exception exception = {
5067                 .interruptible = true,
5068         };
5069         struct nfs4_label l, *label;
5070         int err;
5071
5072         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5073
5074         do {
5075                 err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label);
5076                 trace_nfs4_symlink(dir, &dentry->d_name, err);
5077                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5078                                 &exception);
5079         } while (exception.retry);
5080
5081         nfs4_label_release_security(label);
5082         return err;
5083 }
5084
5085 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5086                 struct iattr *sattr, struct nfs4_label *label)
5087 {
5088         struct nfs4_createdata *data;
5089         int status = -ENOMEM;
5090
5091         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5092         if (data == NULL)
5093                 goto out;
5094
5095         data->arg.label = label;
5096         status = nfs4_do_create(dir, dentry, data);
5097
5098         nfs4_free_createdata(data);
5099 out:
5100         return status;
5101 }
5102
5103 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5104                 struct iattr *sattr)
5105 {
5106         struct nfs_server *server = NFS_SERVER(dir);
5107         struct nfs4_exception exception = {
5108                 .interruptible = true,
5109         };
5110         struct nfs4_label l, *label;
5111         int err;
5112
5113         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5114
5115         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5116                 sattr->ia_mode &= ~current_umask();
5117         do {
5118                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5119                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5120                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5121                                 &exception);
5122         } while (exception.retry);
5123         nfs4_label_release_security(label);
5124
5125         return err;
5126 }
5127
5128 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5129                               struct nfs_readdir_res *nr_res)
5130 {
5131         struct inode            *dir = d_inode(nr_arg->dentry);
5132         struct nfs_server       *server = NFS_SERVER(dir);
5133         struct nfs4_readdir_arg args = {
5134                 .fh = NFS_FH(dir),
5135                 .pages = nr_arg->pages,
5136                 .pgbase = 0,
5137                 .count = nr_arg->page_len,
5138                 .plus = nr_arg->plus,
5139         };
5140         struct nfs4_readdir_res res;
5141         struct rpc_message msg = {
5142                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5143                 .rpc_argp = &args,
5144                 .rpc_resp = &res,
5145                 .rpc_cred = nr_arg->cred,
5146         };
5147         int                     status;
5148
5149         dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5150                 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5151         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5152                 args.bitmask = server->attr_bitmask_nl;
5153         else
5154                 args.bitmask = server->attr_bitmask;
5155
5156         nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5157         res.pgbase = args.pgbase;
5158         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5159                         &res.seq_res, 0);
5160         if (status >= 0) {
5161                 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5162                 status += args.pgbase;
5163         }
5164
5165         nfs_invalidate_atime(dir);
5166
5167         dprintk("%s: returns %d\n", __func__, status);
5168         return status;
5169 }
5170
5171 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5172                              struct nfs_readdir_res *res)
5173 {
5174         struct nfs4_exception exception = {
5175                 .interruptible = true,
5176         };
5177         int err;
5178         do {
5179                 err = _nfs4_proc_readdir(arg, res);
5180                 trace_nfs4_readdir(d_inode(arg->dentry), err);
5181                 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5182                                             err, &exception);
5183         } while (exception.retry);
5184         return err;
5185 }
5186
5187 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5188                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5189 {
5190         struct nfs4_createdata *data;
5191         int mode = sattr->ia_mode;
5192         int status = -ENOMEM;
5193
5194         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5195         if (data == NULL)
5196                 goto out;
5197
5198         if (S_ISFIFO(mode))
5199                 data->arg.ftype = NF4FIFO;
5200         else if (S_ISBLK(mode)) {
5201                 data->arg.ftype = NF4BLK;
5202                 data->arg.u.device.specdata1 = MAJOR(rdev);
5203                 data->arg.u.device.specdata2 = MINOR(rdev);
5204         }
5205         else if (S_ISCHR(mode)) {
5206                 data->arg.ftype = NF4CHR;
5207                 data->arg.u.device.specdata1 = MAJOR(rdev);
5208                 data->arg.u.device.specdata2 = MINOR(rdev);
5209         } else if (!S_ISSOCK(mode)) {
5210                 status = -EINVAL;
5211                 goto out_free;
5212         }
5213
5214         data->arg.label = label;
5215         status = nfs4_do_create(dir, dentry, data);
5216 out_free:
5217         nfs4_free_createdata(data);
5218 out:
5219         return status;
5220 }
5221
5222 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5223                 struct iattr *sattr, dev_t rdev)
5224 {
5225         struct nfs_server *server = NFS_SERVER(dir);
5226         struct nfs4_exception exception = {
5227                 .interruptible = true,
5228         };
5229         struct nfs4_label l, *label;
5230         int err;
5231
5232         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5233
5234         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5235                 sattr->ia_mode &= ~current_umask();
5236         do {
5237                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5238                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5239                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5240                                 &exception);
5241         } while (exception.retry);
5242
5243         nfs4_label_release_security(label);
5244
5245         return err;
5246 }
5247
5248 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5249                  struct nfs_fsstat *fsstat)
5250 {
5251         struct nfs4_statfs_arg args = {
5252                 .fh = fhandle,
5253                 .bitmask = server->attr_bitmask,
5254         };
5255         struct nfs4_statfs_res res = {
5256                 .fsstat = fsstat,
5257         };
5258         struct rpc_message msg = {
5259                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5260                 .rpc_argp = &args,
5261                 .rpc_resp = &res,
5262         };
5263
5264         nfs_fattr_init(fsstat->fattr);
5265         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5266 }
5267
5268 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5269 {
5270         struct nfs4_exception exception = {
5271                 .interruptible = true,
5272         };
5273         int err;
5274         do {
5275                 err = nfs4_handle_exception(server,
5276                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5277                                 &exception);
5278         } while (exception.retry);
5279         return err;
5280 }
5281
5282 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5283                 struct nfs_fsinfo *fsinfo)
5284 {
5285         struct nfs4_fsinfo_arg args = {
5286                 .fh = fhandle,
5287                 .bitmask = server->attr_bitmask,
5288         };
5289         struct nfs4_fsinfo_res res = {
5290                 .fsinfo = fsinfo,
5291         };
5292         struct rpc_message msg = {
5293                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5294                 .rpc_argp = &args,
5295                 .rpc_resp = &res,
5296         };
5297
5298         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5299 }
5300
5301 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5302 {
5303         struct nfs4_exception exception = {
5304                 .interruptible = true,
5305         };
5306         int err;
5307
5308         do {
5309                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5310                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5311                 if (err == 0) {
5312                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5313                         break;
5314                 }
5315                 err = nfs4_handle_exception(server, err, &exception);
5316         } while (exception.retry);
5317         return err;
5318 }
5319
5320 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5321 {
5322         int error;
5323
5324         nfs_fattr_init(fsinfo->fattr);
5325         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5326         if (error == 0) {
5327                 /* block layout checks this! */
5328                 server->pnfs_blksize = fsinfo->blksize;
5329                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5330         }
5331
5332         return error;
5333 }
5334
5335 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5336                 struct nfs_pathconf *pathconf)
5337 {
5338         struct nfs4_pathconf_arg args = {
5339                 .fh = fhandle,
5340                 .bitmask = server->attr_bitmask,
5341         };
5342         struct nfs4_pathconf_res res = {
5343                 .pathconf = pathconf,
5344         };
5345         struct rpc_message msg = {
5346                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5347                 .rpc_argp = &args,
5348                 .rpc_resp = &res,
5349         };
5350
5351         /* None of the pathconf attributes are mandatory to implement */
5352         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5353                 memset(pathconf, 0, sizeof(*pathconf));
5354                 return 0;
5355         }
5356
5357         nfs_fattr_init(pathconf->fattr);
5358         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5359 }
5360
5361 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5362                 struct nfs_pathconf *pathconf)
5363 {
5364         struct nfs4_exception exception = {
5365                 .interruptible = true,
5366         };
5367         int err;
5368
5369         do {
5370                 err = nfs4_handle_exception(server,
5371                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5372                                 &exception);
5373         } while (exception.retry);
5374         return err;
5375 }
5376
5377 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5378                 const struct nfs_open_context *ctx,
5379                 const struct nfs_lock_context *l_ctx,
5380                 fmode_t fmode)
5381 {
5382         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5383 }
5384 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5385
5386 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5387                 const struct nfs_open_context *ctx,
5388                 const struct nfs_lock_context *l_ctx,
5389                 fmode_t fmode)
5390 {
5391         nfs4_stateid _current_stateid;
5392
5393         /* If the current stateid represents a lost lock, then exit */
5394         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5395                 return true;
5396         return nfs4_stateid_match(stateid, &_current_stateid);
5397 }
5398
5399 static bool nfs4_error_stateid_expired(int err)
5400 {
5401         switch (err) {
5402         case -NFS4ERR_DELEG_REVOKED:
5403         case -NFS4ERR_ADMIN_REVOKED:
5404         case -NFS4ERR_BAD_STATEID:
5405         case -NFS4ERR_STALE_STATEID:
5406         case -NFS4ERR_OLD_STATEID:
5407         case -NFS4ERR_OPENMODE:
5408         case -NFS4ERR_EXPIRED:
5409                 return true;
5410         }
5411         return false;
5412 }
5413
5414 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5415 {
5416         struct nfs_server *server = NFS_SERVER(hdr->inode);
5417
5418         trace_nfs4_read(hdr, task->tk_status);
5419         if (task->tk_status < 0) {
5420                 struct nfs4_exception exception = {
5421                         .inode = hdr->inode,
5422                         .state = hdr->args.context->state,
5423                         .stateid = &hdr->args.stateid,
5424                 };
5425                 task->tk_status = nfs4_async_handle_exception(task,
5426                                 server, task->tk_status, &exception);
5427                 if (exception.retry) {
5428                         rpc_restart_call_prepare(task);
5429                         return -EAGAIN;
5430                 }
5431         }
5432
5433         if (task->tk_status > 0)
5434                 renew_lease(server, hdr->timestamp);
5435         return 0;
5436 }
5437
5438 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5439                 struct nfs_pgio_args *args)
5440 {
5441
5442         if (!nfs4_error_stateid_expired(task->tk_status) ||
5443                 nfs4_stateid_is_current(&args->stateid,
5444                                 args->context,
5445                                 args->lock_context,
5446                                 FMODE_READ))
5447                 return false;
5448         rpc_restart_call_prepare(task);
5449         return true;
5450 }
5451
5452 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5453                                          struct nfs_pgio_header *hdr)
5454 {
5455         struct nfs_server *server = NFS_SERVER(hdr->inode);
5456         struct rpc_message *msg = &task->tk_msg;
5457
5458         if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5459             server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5460                 server->caps &= ~NFS_CAP_READ_PLUS;
5461                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5462                 rpc_restart_call_prepare(task);
5463                 return true;
5464         }
5465         return false;
5466 }
5467
5468 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5469 {
5470         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5471                 return -EAGAIN;
5472         if (nfs4_read_stateid_changed(task, &hdr->args))
5473                 return -EAGAIN;
5474         if (nfs4_read_plus_not_supported(task, hdr))
5475                 return -EAGAIN;
5476         if (task->tk_status > 0)
5477                 nfs_invalidate_atime(hdr->inode);
5478         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5479                                     nfs4_read_done_cb(task, hdr);
5480 }
5481
5482 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5483 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5484                                     struct rpc_message *msg)
5485 {
5486         /* Note: We don't use READ_PLUS with pNFS yet */
5487         if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5488                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5489                 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5490         }
5491         return false;
5492 }
5493 #else
5494 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5495                                     struct rpc_message *msg)
5496 {
5497         return false;
5498 }
5499 #endif /* CONFIG_NFS_V4_2 */
5500
5501 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5502                                  struct rpc_message *msg)
5503 {
5504         hdr->timestamp   = jiffies;
5505         if (!hdr->pgio_done_cb)
5506                 hdr->pgio_done_cb = nfs4_read_done_cb;
5507         if (!nfs42_read_plus_support(hdr, msg))
5508                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5509         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5510 }
5511
5512 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5513                                       struct nfs_pgio_header *hdr)
5514 {
5515         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5516                         &hdr->args.seq_args,
5517                         &hdr->res.seq_res,
5518                         task))
5519                 return 0;
5520         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5521                                 hdr->args.lock_context,
5522                                 hdr->rw_mode) == -EIO)
5523                 return -EIO;
5524         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5525                 return -EIO;
5526         return 0;
5527 }
5528
5529 static int nfs4_write_done_cb(struct rpc_task *task,
5530                               struct nfs_pgio_header *hdr)
5531 {
5532         struct inode *inode = hdr->inode;
5533
5534         trace_nfs4_write(hdr, task->tk_status);
5535         if (task->tk_status < 0) {
5536                 struct nfs4_exception exception = {
5537                         .inode = hdr->inode,
5538                         .state = hdr->args.context->state,
5539                         .stateid = &hdr->args.stateid,
5540                 };
5541                 task->tk_status = nfs4_async_handle_exception(task,
5542                                 NFS_SERVER(inode), task->tk_status,
5543                                 &exception);
5544                 if (exception.retry) {
5545                         rpc_restart_call_prepare(task);
5546                         return -EAGAIN;
5547                 }
5548         }
5549         if (task->tk_status >= 0) {
5550                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5551                 nfs_writeback_update_inode(hdr);
5552         }
5553         return 0;
5554 }
5555
5556 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5557                 struct nfs_pgio_args *args)
5558 {
5559
5560         if (!nfs4_error_stateid_expired(task->tk_status) ||
5561                 nfs4_stateid_is_current(&args->stateid,
5562                                 args->context,
5563                                 args->lock_context,
5564                                 FMODE_WRITE))
5565                 return false;
5566         rpc_restart_call_prepare(task);
5567         return true;
5568 }
5569
5570 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5571 {
5572         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5573                 return -EAGAIN;
5574         if (nfs4_write_stateid_changed(task, &hdr->args))
5575                 return -EAGAIN;
5576         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5577                 nfs4_write_done_cb(task, hdr);
5578 }
5579
5580 static
5581 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5582 {
5583         /* Don't request attributes for pNFS or O_DIRECT writes */
5584         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5585                 return false;
5586         /* Otherwise, request attributes if and only if we don't hold
5587          * a delegation
5588          */
5589         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5590 }
5591
5592 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5593                       struct inode *inode, unsigned long cache_validity)
5594 {
5595         struct nfs_server *server = NFS_SERVER(inode);
5596         unsigned int i;
5597
5598         memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5599         cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5600
5601         if (cache_validity & NFS_INO_INVALID_CHANGE)
5602                 bitmask[0] |= FATTR4_WORD0_CHANGE;
5603         if (cache_validity & NFS_INO_INVALID_ATIME)
5604                 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5605         if (cache_validity & NFS_INO_INVALID_MODE)
5606                 bitmask[1] |= FATTR4_WORD1_MODE;
5607         if (cache_validity & NFS_INO_INVALID_OTHER)
5608                 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5609         if (cache_validity & NFS_INO_INVALID_NLINK)
5610                 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5611         if (cache_validity & NFS_INO_INVALID_CTIME)
5612                 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5613         if (cache_validity & NFS_INO_INVALID_MTIME)
5614                 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5615         if (cache_validity & NFS_INO_INVALID_BLOCKS)
5616                 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5617
5618         if (cache_validity & NFS_INO_INVALID_SIZE)
5619                 bitmask[0] |= FATTR4_WORD0_SIZE;
5620
5621         for (i = 0; i < NFS4_BITMASK_SZ; i++)
5622                 bitmask[i] &= server->attr_bitmask[i];
5623 }
5624
5625 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5626                                   struct rpc_message *msg,
5627                                   struct rpc_clnt **clnt)
5628 {
5629         struct nfs_server *server = NFS_SERVER(hdr->inode);
5630
5631         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5632                 hdr->args.bitmask = NULL;
5633                 hdr->res.fattr = NULL;
5634         } else {
5635                 nfs4_bitmask_set(hdr->args.bitmask_store,
5636                                  server->cache_consistency_bitmask,
5637                                  hdr->inode, NFS_INO_INVALID_BLOCKS);
5638                 hdr->args.bitmask = hdr->args.bitmask_store;
5639         }
5640
5641         if (!hdr->pgio_done_cb)
5642                 hdr->pgio_done_cb = nfs4_write_done_cb;
5643         hdr->res.server = server;
5644         hdr->timestamp   = jiffies;
5645
5646         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5647         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5648         nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
5649 }
5650
5651 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5652 {
5653         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5654                         &data->args.seq_args,
5655                         &data->res.seq_res,
5656                         task);
5657 }
5658
5659 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5660 {
5661         struct inode *inode = data->inode;
5662
5663         trace_nfs4_commit(data, task->tk_status);
5664         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5665                                     NULL, NULL) == -EAGAIN) {
5666                 rpc_restart_call_prepare(task);
5667                 return -EAGAIN;
5668         }
5669         return 0;
5670 }
5671
5672 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5673 {
5674         if (!nfs4_sequence_done(task, &data->res.seq_res))
5675                 return -EAGAIN;
5676         return data->commit_done_cb(task, data);
5677 }
5678
5679 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5680                                    struct rpc_clnt **clnt)
5681 {
5682         struct nfs_server *server = NFS_SERVER(data->inode);
5683
5684         if (data->commit_done_cb == NULL)
5685                 data->commit_done_cb = nfs4_commit_done_cb;
5686         data->res.server = server;
5687         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5688         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5689         nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
5690                         NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5691 }
5692
5693 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5694                                 struct nfs_commitres *res)
5695 {
5696         struct inode *dst_inode = file_inode(dst);
5697         struct nfs_server *server = NFS_SERVER(dst_inode);
5698         struct rpc_message msg = {
5699                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5700                 .rpc_argp = args,
5701                 .rpc_resp = res,
5702         };
5703
5704         args->fh = NFS_FH(dst_inode);
5705         return nfs4_call_sync(server->client, server, &msg,
5706                         &args->seq_args, &res->seq_res, 1);
5707 }
5708
5709 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5710 {
5711         struct nfs_commitargs args = {
5712                 .offset = offset,
5713                 .count = count,
5714         };
5715         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5716         struct nfs4_exception exception = { };
5717         int status;
5718
5719         do {
5720                 status = _nfs4_proc_commit(dst, &args, res);
5721                 status = nfs4_handle_exception(dst_server, status, &exception);
5722         } while (exception.retry);
5723
5724         return status;
5725 }
5726
5727 struct nfs4_renewdata {
5728         struct nfs_client       *client;
5729         unsigned long           timestamp;
5730 };
5731
5732 /*
5733  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5734  * standalone procedure for queueing an asynchronous RENEW.
5735  */
5736 static void nfs4_renew_release(void *calldata)
5737 {
5738         struct nfs4_renewdata *data = calldata;
5739         struct nfs_client *clp = data->client;
5740
5741         if (refcount_read(&clp->cl_count) > 1)
5742                 nfs4_schedule_state_renewal(clp);
5743         nfs_put_client(clp);
5744         kfree(data);
5745 }
5746
5747 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5748 {
5749         struct nfs4_renewdata *data = calldata;
5750         struct nfs_client *clp = data->client;
5751         unsigned long timestamp = data->timestamp;
5752
5753         trace_nfs4_renew_async(clp, task->tk_status);
5754         switch (task->tk_status) {
5755         case 0:
5756                 break;
5757         case -NFS4ERR_LEASE_MOVED:
5758                 nfs4_schedule_lease_moved_recovery(clp);
5759                 break;
5760         default:
5761                 /* Unless we're shutting down, schedule state recovery! */
5762                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5763                         return;
5764                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5765                         nfs4_schedule_lease_recovery(clp);
5766                         return;
5767                 }
5768                 nfs4_schedule_path_down_recovery(clp);
5769         }
5770         do_renew_lease(clp, timestamp);
5771 }
5772
5773 static const struct rpc_call_ops nfs4_renew_ops = {
5774         .rpc_call_done = nfs4_renew_done,
5775         .rpc_release = nfs4_renew_release,
5776 };
5777
5778 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5779 {
5780         struct rpc_message msg = {
5781                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5782                 .rpc_argp       = clp,
5783                 .rpc_cred       = cred,
5784         };
5785         struct nfs4_renewdata *data;
5786
5787         if (renew_flags == 0)
5788                 return 0;
5789         if (!refcount_inc_not_zero(&clp->cl_count))
5790                 return -EIO;
5791         data = kmalloc(sizeof(*data), GFP_NOFS);
5792         if (data == NULL) {
5793                 nfs_put_client(clp);
5794                 return -ENOMEM;
5795         }
5796         data->client = clp;
5797         data->timestamp = jiffies;
5798         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5799                         &nfs4_renew_ops, data);
5800 }
5801
5802 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5803 {
5804         struct rpc_message msg = {
5805                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5806                 .rpc_argp       = clp,
5807                 .rpc_cred       = cred,
5808         };
5809         unsigned long now = jiffies;
5810         int status;
5811
5812         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5813         if (status < 0)
5814                 return status;
5815         do_renew_lease(clp, now);
5816         return 0;
5817 }
5818
5819 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5820                                       enum nfs4_acl_type type)
5821 {
5822         switch (type) {
5823         default:
5824                 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5825         case NFS4ACL_DACL:
5826                 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5827         case NFS4ACL_SACL:
5828                 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5829         }
5830 }
5831
5832 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5833  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5834  * the stack.
5835  */
5836 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5837
5838 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5839                 struct page **pages)
5840 {
5841         struct page *newpage, **spages;
5842         int rc = 0;
5843         size_t len;
5844         spages = pages;
5845
5846         do {
5847                 len = min_t(size_t, PAGE_SIZE, buflen);
5848                 newpage = alloc_page(GFP_KERNEL);
5849
5850                 if (newpage == NULL)
5851                         goto unwind;
5852                 memcpy(page_address(newpage), buf, len);
5853                 buf += len;
5854                 buflen -= len;
5855                 *pages++ = newpage;
5856                 rc++;
5857         } while (buflen != 0);
5858
5859         return rc;
5860
5861 unwind:
5862         for(; rc > 0; rc--)
5863                 __free_page(spages[rc-1]);
5864         return -ENOMEM;
5865 }
5866
5867 struct nfs4_cached_acl {
5868         enum nfs4_acl_type type;
5869         int cached;
5870         size_t len;
5871         char data[];
5872 };
5873
5874 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5875 {
5876         struct nfs_inode *nfsi = NFS_I(inode);
5877
5878         spin_lock(&inode->i_lock);
5879         kfree(nfsi->nfs4_acl);
5880         nfsi->nfs4_acl = acl;
5881         spin_unlock(&inode->i_lock);
5882 }
5883
5884 static void nfs4_zap_acl_attr(struct inode *inode)
5885 {
5886         nfs4_set_cached_acl(inode, NULL);
5887 }
5888
5889 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5890                                     size_t buflen, enum nfs4_acl_type type)
5891 {
5892         struct nfs_inode *nfsi = NFS_I(inode);
5893         struct nfs4_cached_acl *acl;
5894         int ret = -ENOENT;
5895
5896         spin_lock(&inode->i_lock);
5897         acl = nfsi->nfs4_acl;
5898         if (acl == NULL)
5899                 goto out;
5900         if (acl->type != type)
5901                 goto out;
5902         if (buf == NULL) /* user is just asking for length */
5903                 goto out_len;
5904         if (acl->cached == 0)
5905                 goto out;
5906         ret = -ERANGE; /* see getxattr(2) man page */
5907         if (acl->len > buflen)
5908                 goto out;
5909         memcpy(buf, acl->data, acl->len);
5910 out_len:
5911         ret = acl->len;
5912 out:
5913         spin_unlock(&inode->i_lock);
5914         return ret;
5915 }
5916
5917 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5918                                   size_t pgbase, size_t acl_len,
5919                                   enum nfs4_acl_type type)
5920 {
5921         struct nfs4_cached_acl *acl;
5922         size_t buflen = sizeof(*acl) + acl_len;
5923
5924         if (buflen <= PAGE_SIZE) {
5925                 acl = kmalloc(buflen, GFP_KERNEL);
5926                 if (acl == NULL)
5927                         goto out;
5928                 acl->cached = 1;
5929                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5930         } else {
5931                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5932                 if (acl == NULL)
5933                         goto out;
5934                 acl->cached = 0;
5935         }
5936         acl->type = type;
5937         acl->len = acl_len;
5938 out:
5939         nfs4_set_cached_acl(inode, acl);
5940 }
5941
5942 /*
5943  * The getxattr API returns the required buffer length when called with a
5944  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5945  * the required buf.  On a NULL buf, we send a page of data to the server
5946  * guessing that the ACL request can be serviced by a page. If so, we cache
5947  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5948  * the cache. If not so, we throw away the page, and cache the required
5949  * length. The next getxattr call will then produce another round trip to
5950  * the server, this time with the input buf of the required size.
5951  */
5952 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5953                                        size_t buflen, enum nfs4_acl_type type)
5954 {
5955         struct page **pages;
5956         struct nfs_getaclargs args = {
5957                 .fh = NFS_FH(inode),
5958                 .acl_type = type,
5959                 .acl_len = buflen,
5960         };
5961         struct nfs_getaclres res = {
5962                 .acl_type = type,
5963                 .acl_len = buflen,
5964         };
5965         struct rpc_message msg = {
5966                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5967                 .rpc_argp = &args,
5968                 .rpc_resp = &res,
5969         };
5970         unsigned int npages;
5971         int ret = -ENOMEM, i;
5972         struct nfs_server *server = NFS_SERVER(inode);
5973
5974         if (buflen == 0)
5975                 buflen = server->rsize;
5976
5977         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5978         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5979         if (!pages)
5980                 return -ENOMEM;
5981
5982         args.acl_pages = pages;
5983
5984         for (i = 0; i < npages; i++) {
5985                 pages[i] = alloc_page(GFP_KERNEL);
5986                 if (!pages[i])
5987                         goto out_free;
5988         }
5989
5990         /* for decoding across pages */
5991         res.acl_scratch = alloc_page(GFP_KERNEL);
5992         if (!res.acl_scratch)
5993                 goto out_free;
5994
5995         args.acl_len = npages * PAGE_SIZE;
5996
5997         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5998                 __func__, buf, buflen, npages, args.acl_len);
5999         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
6000                              &msg, &args.seq_args, &res.seq_res, 0);
6001         if (ret)
6002                 goto out_free;
6003
6004         /* Handle the case where the passed-in buffer is too short */
6005         if (res.acl_flags & NFS4_ACL_TRUNC) {
6006                 /* Did the user only issue a request for the acl length? */
6007                 if (buf == NULL)
6008                         goto out_ok;
6009                 ret = -ERANGE;
6010                 goto out_free;
6011         }
6012         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
6013                               type);
6014         if (buf) {
6015                 if (res.acl_len > buflen) {
6016                         ret = -ERANGE;
6017                         goto out_free;
6018                 }
6019                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
6020         }
6021 out_ok:
6022         ret = res.acl_len;
6023 out_free:
6024         while (--i >= 0)
6025                 __free_page(pages[i]);
6026         if (res.acl_scratch)
6027                 __free_page(res.acl_scratch);
6028         kfree(pages);
6029         return ret;
6030 }
6031
6032 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6033                                      size_t buflen, enum nfs4_acl_type type)
6034 {
6035         struct nfs4_exception exception = {
6036                 .interruptible = true,
6037         };
6038         ssize_t ret;
6039         do {
6040                 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6041                 trace_nfs4_get_acl(inode, ret);
6042                 if (ret >= 0)
6043                         break;
6044                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6045         } while (exception.retry);
6046         return ret;
6047 }
6048
6049 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6050                                  enum nfs4_acl_type type)
6051 {
6052         struct nfs_server *server = NFS_SERVER(inode);
6053         int ret;
6054
6055         if (!nfs4_server_supports_acls(server, type))
6056                 return -EOPNOTSUPP;
6057         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6058         if (ret < 0)
6059                 return ret;
6060         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6061                 nfs_zap_acl_cache(inode);
6062         ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6063         if (ret != -ENOENT)
6064                 /* -ENOENT is returned if there is no ACL or if there is an ACL
6065                  * but no cached acl data, just the acl length */
6066                 return ret;
6067         return nfs4_get_acl_uncached(inode, buf, buflen, type);
6068 }
6069
6070 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6071                                size_t buflen, enum nfs4_acl_type type)
6072 {
6073         struct nfs_server *server = NFS_SERVER(inode);
6074         struct page *pages[NFS4ACL_MAXPAGES];
6075         struct nfs_setaclargs arg = {
6076                 .fh = NFS_FH(inode),
6077                 .acl_type = type,
6078                 .acl_len = buflen,
6079                 .acl_pages = pages,
6080         };
6081         struct nfs_setaclres res;
6082         struct rpc_message msg = {
6083                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6084                 .rpc_argp       = &arg,
6085                 .rpc_resp       = &res,
6086         };
6087         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6088         int ret, i;
6089
6090         /* You can't remove system.nfs4_acl: */
6091         if (buflen == 0)
6092                 return -EINVAL;
6093         if (!nfs4_server_supports_acls(server, type))
6094                 return -EOPNOTSUPP;
6095         if (npages > ARRAY_SIZE(pages))
6096                 return -ERANGE;
6097         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6098         if (i < 0)
6099                 return i;
6100         nfs4_inode_make_writeable(inode);
6101         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6102
6103         /*
6104          * Free each page after tx, so the only ref left is
6105          * held by the network stack
6106          */
6107         for (; i > 0; i--)
6108                 put_page(pages[i-1]);
6109
6110         /*
6111          * Acl update can result in inode attribute update.
6112          * so mark the attribute cache invalid.
6113          */
6114         spin_lock(&inode->i_lock);
6115         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6116                                              NFS_INO_INVALID_CTIME |
6117                                              NFS_INO_REVAL_FORCED);
6118         spin_unlock(&inode->i_lock);
6119         nfs_access_zap_cache(inode);
6120         nfs_zap_acl_cache(inode);
6121         return ret;
6122 }
6123
6124 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6125                              size_t buflen, enum nfs4_acl_type type)
6126 {
6127         struct nfs4_exception exception = { };
6128         int err;
6129         do {
6130                 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6131                 trace_nfs4_set_acl(inode, err);
6132                 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6133                         /*
6134                          * no need to retry since the kernel
6135                          * isn't involved in encoding the ACEs.
6136                          */
6137                         err = -EINVAL;
6138                         break;
6139                 }
6140                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6141                                 &exception);
6142         } while (exception.retry);
6143         return err;
6144 }
6145
6146 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6147 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6148                                         size_t buflen)
6149 {
6150         struct nfs_server *server = NFS_SERVER(inode);
6151         struct nfs4_label label = {0, 0, buflen, buf};
6152
6153         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6154         struct nfs_fattr fattr = {
6155                 .label = &label,
6156         };
6157         struct nfs4_getattr_arg arg = {
6158                 .fh             = NFS_FH(inode),
6159                 .bitmask        = bitmask,
6160         };
6161         struct nfs4_getattr_res res = {
6162                 .fattr          = &fattr,
6163                 .server         = server,
6164         };
6165         struct rpc_message msg = {
6166                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6167                 .rpc_argp       = &arg,
6168                 .rpc_resp       = &res,
6169         };
6170         int ret;
6171
6172         nfs_fattr_init(&fattr);
6173
6174         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6175         if (ret)
6176                 return ret;
6177         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6178                 return -ENOENT;
6179         return label.len;
6180 }
6181
6182 static int nfs4_get_security_label(struct inode *inode, void *buf,
6183                                         size_t buflen)
6184 {
6185         struct nfs4_exception exception = {
6186                 .interruptible = true,
6187         };
6188         int err;
6189
6190         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6191                 return -EOPNOTSUPP;
6192
6193         do {
6194                 err = _nfs4_get_security_label(inode, buf, buflen);
6195                 trace_nfs4_get_security_label(inode, err);
6196                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6197                                 &exception);
6198         } while (exception.retry);
6199         return err;
6200 }
6201
6202 static int _nfs4_do_set_security_label(struct inode *inode,
6203                 struct nfs4_label *ilabel,
6204                 struct nfs_fattr *fattr)
6205 {
6206
6207         struct iattr sattr = {0};
6208         struct nfs_server *server = NFS_SERVER(inode);
6209         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6210         struct nfs_setattrargs arg = {
6211                 .fh             = NFS_FH(inode),
6212                 .iap            = &sattr,
6213                 .server         = server,
6214                 .bitmask        = bitmask,
6215                 .label          = ilabel,
6216         };
6217         struct nfs_setattrres res = {
6218                 .fattr          = fattr,
6219                 .server         = server,
6220         };
6221         struct rpc_message msg = {
6222                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6223                 .rpc_argp       = &arg,
6224                 .rpc_resp       = &res,
6225         };
6226         int status;
6227
6228         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6229
6230         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6231         if (status)
6232                 dprintk("%s failed: %d\n", __func__, status);
6233
6234         return status;
6235 }
6236
6237 static int nfs4_do_set_security_label(struct inode *inode,
6238                 struct nfs4_label *ilabel,
6239                 struct nfs_fattr *fattr)
6240 {
6241         struct nfs4_exception exception = { };
6242         int err;
6243
6244         do {
6245                 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6246                 trace_nfs4_set_security_label(inode, err);
6247                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6248                                 &exception);
6249         } while (exception.retry);
6250         return err;
6251 }
6252
6253 static int
6254 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6255 {
6256         struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6257         struct nfs_fattr *fattr;
6258         int status;
6259
6260         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6261                 return -EOPNOTSUPP;
6262
6263         fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6264         if (fattr == NULL)
6265                 return -ENOMEM;
6266
6267         status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6268         if (status == 0)
6269                 nfs_setsecurity(inode, fattr);
6270
6271         return status;
6272 }
6273 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6274
6275
6276 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6277                                     nfs4_verifier *bootverf)
6278 {
6279         __be32 verf[2];
6280
6281         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6282                 /* An impossible timestamp guarantees this value
6283                  * will never match a generated boot time. */
6284                 verf[0] = cpu_to_be32(U32_MAX);
6285                 verf[1] = cpu_to_be32(U32_MAX);
6286         } else {
6287                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6288                 u64 ns = ktime_to_ns(nn->boot_time);
6289
6290                 verf[0] = cpu_to_be32(ns >> 32);
6291                 verf[1] = cpu_to_be32(ns);
6292         }
6293         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6294 }
6295
6296 static size_t
6297 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6298 {
6299         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6300         struct nfs_netns_client *nn_clp = nn->nfs_client;
6301         const char *id;
6302
6303         buf[0] = '\0';
6304
6305         if (nn_clp) {
6306                 rcu_read_lock();
6307                 id = rcu_dereference(nn_clp->identifier);
6308                 if (id)
6309                         strscpy(buf, id, buflen);
6310                 rcu_read_unlock();
6311         }
6312
6313         if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6314                 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6315
6316         return strlen(buf);
6317 }
6318
6319 static int
6320 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6321 {
6322         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6323         size_t buflen;
6324         size_t len;
6325         char *str;
6326
6327         if (clp->cl_owner_id != NULL)
6328                 return 0;
6329
6330         rcu_read_lock();
6331         len = 14 +
6332                 strlen(clp->cl_rpcclient->cl_nodename) +
6333                 1 +
6334                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6335                 1;
6336         rcu_read_unlock();
6337
6338         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6339         if (buflen)
6340                 len += buflen + 1;
6341
6342         if (len > NFS4_OPAQUE_LIMIT + 1)
6343                 return -EINVAL;
6344
6345         /*
6346          * Since this string is allocated at mount time, and held until the
6347          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6348          * about a memory-reclaim deadlock.
6349          */
6350         str = kmalloc(len, GFP_KERNEL);
6351         if (!str)
6352                 return -ENOMEM;
6353
6354         rcu_read_lock();
6355         if (buflen)
6356                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6357                           clp->cl_rpcclient->cl_nodename, buf,
6358                           rpc_peeraddr2str(clp->cl_rpcclient,
6359                                            RPC_DISPLAY_ADDR));
6360         else
6361                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6362                           clp->cl_rpcclient->cl_nodename,
6363                           rpc_peeraddr2str(clp->cl_rpcclient,
6364                                            RPC_DISPLAY_ADDR));
6365         rcu_read_unlock();
6366
6367         clp->cl_owner_id = str;
6368         return 0;
6369 }
6370
6371 static int
6372 nfs4_init_uniform_client_string(struct nfs_client *clp)
6373 {
6374         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6375         size_t buflen;
6376         size_t len;
6377         char *str;
6378
6379         if (clp->cl_owner_id != NULL)
6380                 return 0;
6381
6382         len = 10 + 10 + 1 + 10 + 1 +
6383                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6384
6385         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6386         if (buflen)
6387                 len += buflen + 1;
6388
6389         if (len > NFS4_OPAQUE_LIMIT + 1)
6390                 return -EINVAL;
6391
6392         /*
6393          * Since this string is allocated at mount time, and held until the
6394          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6395          * about a memory-reclaim deadlock.
6396          */
6397         str = kmalloc(len, GFP_KERNEL);
6398         if (!str)
6399                 return -ENOMEM;
6400
6401         if (buflen)
6402                 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6403                           clp->rpc_ops->version, clp->cl_minorversion,
6404                           buf, clp->cl_rpcclient->cl_nodename);
6405         else
6406                 scnprintf(str, len, "Linux NFSv%u.%u %s",
6407                           clp->rpc_ops->version, clp->cl_minorversion,
6408                           clp->cl_rpcclient->cl_nodename);
6409         clp->cl_owner_id = str;
6410         return 0;
6411 }
6412
6413 /*
6414  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6415  * services.  Advertise one based on the address family of the
6416  * clientaddr.
6417  */
6418 static unsigned int
6419 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6420 {
6421         if (strchr(clp->cl_ipaddr, ':') != NULL)
6422                 return scnprintf(buf, len, "tcp6");
6423         else
6424                 return scnprintf(buf, len, "tcp");
6425 }
6426
6427 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6428 {
6429         struct nfs4_setclientid *sc = calldata;
6430
6431         if (task->tk_status == 0)
6432                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6433 }
6434
6435 static const struct rpc_call_ops nfs4_setclientid_ops = {
6436         .rpc_call_done = nfs4_setclientid_done,
6437 };
6438
6439 /**
6440  * nfs4_proc_setclientid - Negotiate client ID
6441  * @clp: state data structure
6442  * @program: RPC program for NFSv4 callback service
6443  * @port: IP port number for NFS4 callback service
6444  * @cred: credential to use for this call
6445  * @res: where to place the result
6446  *
6447  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6448  */
6449 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6450                 unsigned short port, const struct cred *cred,
6451                 struct nfs4_setclientid_res *res)
6452 {
6453         nfs4_verifier sc_verifier;
6454         struct nfs4_setclientid setclientid = {
6455                 .sc_verifier = &sc_verifier,
6456                 .sc_prog = program,
6457                 .sc_clnt = clp,
6458         };
6459         struct rpc_message msg = {
6460                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6461                 .rpc_argp = &setclientid,
6462                 .rpc_resp = res,
6463                 .rpc_cred = cred,
6464         };
6465         struct rpc_task_setup task_setup_data = {
6466                 .rpc_client = clp->cl_rpcclient,
6467                 .rpc_message = &msg,
6468                 .callback_ops = &nfs4_setclientid_ops,
6469                 .callback_data = &setclientid,
6470                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6471         };
6472         unsigned long now = jiffies;
6473         int status;
6474
6475         /* nfs_client_id4 */
6476         nfs4_init_boot_verifier(clp, &sc_verifier);
6477
6478         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6479                 status = nfs4_init_uniform_client_string(clp);
6480         else
6481                 status = nfs4_init_nonuniform_client_string(clp);
6482
6483         if (status)
6484                 goto out;
6485
6486         /* cb_client4 */
6487         setclientid.sc_netid_len =
6488                                 nfs4_init_callback_netid(clp,
6489                                                 setclientid.sc_netid,
6490                                                 sizeof(setclientid.sc_netid));
6491         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6492                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6493                                 clp->cl_ipaddr, port >> 8, port & 255);
6494
6495         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6496                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6497                 clp->cl_owner_id);
6498
6499         status = nfs4_call_sync_custom(&task_setup_data);
6500         if (setclientid.sc_cred) {
6501                 kfree(clp->cl_acceptor);
6502                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6503                 put_rpccred(setclientid.sc_cred);
6504         }
6505
6506         if (status == 0)
6507                 do_renew_lease(clp, now);
6508 out:
6509         trace_nfs4_setclientid(clp, status);
6510         dprintk("NFS reply setclientid: %d\n", status);
6511         return status;
6512 }
6513
6514 /**
6515  * nfs4_proc_setclientid_confirm - Confirm client ID
6516  * @clp: state data structure
6517  * @arg: result of a previous SETCLIENTID
6518  * @cred: credential to use for this call
6519  *
6520  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6521  */
6522 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6523                 struct nfs4_setclientid_res *arg,
6524                 const struct cred *cred)
6525 {
6526         struct rpc_message msg = {
6527                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6528                 .rpc_argp = arg,
6529                 .rpc_cred = cred,
6530         };
6531         int status;
6532
6533         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6534                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6535                 clp->cl_clientid);
6536         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6537                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6538         trace_nfs4_setclientid_confirm(clp, status);
6539         dprintk("NFS reply setclientid_confirm: %d\n", status);
6540         return status;
6541 }
6542
6543 struct nfs4_delegreturndata {
6544         struct nfs4_delegreturnargs args;
6545         struct nfs4_delegreturnres res;
6546         struct nfs_fh fh;
6547         nfs4_stateid stateid;
6548         unsigned long timestamp;
6549         struct {
6550                 struct nfs4_layoutreturn_args arg;
6551                 struct nfs4_layoutreturn_res res;
6552                 struct nfs4_xdr_opaque_data ld_private;
6553                 u32 roc_barrier;
6554                 bool roc;
6555         } lr;
6556         struct nfs_fattr fattr;
6557         int rpc_status;
6558         struct inode *inode;
6559 };
6560
6561 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6562 {
6563         struct nfs4_delegreturndata *data = calldata;
6564         struct nfs4_exception exception = {
6565                 .inode = data->inode,
6566                 .stateid = &data->stateid,
6567                 .task_is_privileged = data->args.seq_args.sa_privileged,
6568         };
6569
6570         if (!nfs4_sequence_done(task, &data->res.seq_res))
6571                 return;
6572
6573         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6574
6575         /* Handle Layoutreturn errors */
6576         if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6577                           &data->res.lr_ret) == -EAGAIN)
6578                 goto out_restart;
6579
6580         switch (task->tk_status) {
6581         case 0:
6582                 renew_lease(data->res.server, data->timestamp);
6583                 break;
6584         case -NFS4ERR_ADMIN_REVOKED:
6585         case -NFS4ERR_DELEG_REVOKED:
6586         case -NFS4ERR_EXPIRED:
6587                 nfs4_free_revoked_stateid(data->res.server,
6588                                 data->args.stateid,
6589                                 task->tk_msg.rpc_cred);
6590                 fallthrough;
6591         case -NFS4ERR_BAD_STATEID:
6592         case -NFS4ERR_STALE_STATEID:
6593         case -ETIMEDOUT:
6594                 task->tk_status = 0;
6595                 break;
6596         case -NFS4ERR_OLD_STATEID:
6597                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6598                         nfs4_stateid_seqid_inc(&data->stateid);
6599                 if (data->args.bitmask) {
6600                         data->args.bitmask = NULL;
6601                         data->res.fattr = NULL;
6602                 }
6603                 goto out_restart;
6604         case -NFS4ERR_ACCESS:
6605                 if (data->args.bitmask) {
6606                         data->args.bitmask = NULL;
6607                         data->res.fattr = NULL;
6608                         goto out_restart;
6609                 }
6610                 fallthrough;
6611         default:
6612                 task->tk_status = nfs4_async_handle_exception(task,
6613                                 data->res.server, task->tk_status,
6614                                 &exception);
6615                 if (exception.retry)
6616                         goto out_restart;
6617         }
6618         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6619         data->rpc_status = task->tk_status;
6620         return;
6621 out_restart:
6622         task->tk_status = 0;
6623         rpc_restart_call_prepare(task);
6624 }
6625
6626 static void nfs4_delegreturn_release(void *calldata)
6627 {
6628         struct nfs4_delegreturndata *data = calldata;
6629         struct inode *inode = data->inode;
6630
6631         if (data->lr.roc)
6632                 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6633                                  data->res.lr_ret);
6634         if (inode) {
6635                 nfs4_fattr_set_prechange(&data->fattr,
6636                                          inode_peek_iversion_raw(inode));
6637                 nfs_refresh_inode(inode, &data->fattr);
6638                 nfs_iput_and_deactive(inode);
6639         }
6640         kfree(calldata);
6641 }
6642
6643 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6644 {
6645         struct nfs4_delegreturndata *d_data;
6646         struct pnfs_layout_hdr *lo;
6647
6648         d_data = data;
6649
6650         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6651                 nfs4_sequence_done(task, &d_data->res.seq_res);
6652                 return;
6653         }
6654
6655         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6656         if (lo && !pnfs_layout_is_valid(lo)) {
6657                 d_data->args.lr_args = NULL;
6658                 d_data->res.lr_res = NULL;
6659         }
6660
6661         nfs4_setup_sequence(d_data->res.server->nfs_client,
6662                         &d_data->args.seq_args,
6663                         &d_data->res.seq_res,
6664                         task);
6665 }
6666
6667 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6668         .rpc_call_prepare = nfs4_delegreturn_prepare,
6669         .rpc_call_done = nfs4_delegreturn_done,
6670         .rpc_release = nfs4_delegreturn_release,
6671 };
6672
6673 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6674 {
6675         struct nfs4_delegreturndata *data;
6676         struct nfs_server *server = NFS_SERVER(inode);
6677         struct rpc_task *task;
6678         struct rpc_message msg = {
6679                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6680                 .rpc_cred = cred,
6681         };
6682         struct rpc_task_setup task_setup_data = {
6683                 .rpc_client = server->client,
6684                 .rpc_message = &msg,
6685                 .callback_ops = &nfs4_delegreturn_ops,
6686                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6687         };
6688         int status = 0;
6689
6690         if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6691                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6692
6693         data = kzalloc(sizeof(*data), GFP_KERNEL);
6694         if (data == NULL)
6695                 return -ENOMEM;
6696
6697         nfs4_state_protect(server->nfs_client,
6698                         NFS_SP4_MACH_CRED_CLEANUP,
6699                         &task_setup_data.rpc_client, &msg);
6700
6701         data->args.fhandle = &data->fh;
6702         data->args.stateid = &data->stateid;
6703         nfs4_bitmask_set(data->args.bitmask_store,
6704                          server->cache_consistency_bitmask, inode, 0);
6705         data->args.bitmask = data->args.bitmask_store;
6706         nfs_copy_fh(&data->fh, NFS_FH(inode));
6707         nfs4_stateid_copy(&data->stateid, stateid);
6708         data->res.fattr = &data->fattr;
6709         data->res.server = server;
6710         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6711         data->lr.arg.ld_private = &data->lr.ld_private;
6712         nfs_fattr_init(data->res.fattr);
6713         data->timestamp = jiffies;
6714         data->rpc_status = 0;
6715         data->inode = nfs_igrab_and_active(inode);
6716         if (data->inode || issync) {
6717                 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6718                                         cred);
6719                 if (data->lr.roc) {
6720                         data->args.lr_args = &data->lr.arg;
6721                         data->res.lr_res = &data->lr.res;
6722                 }
6723         }
6724
6725         if (!data->inode)
6726                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6727                                    1);
6728         else
6729                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6730                                    0);
6731         task_setup_data.callback_data = data;
6732         msg.rpc_argp = &data->args;
6733         msg.rpc_resp = &data->res;
6734         task = rpc_run_task(&task_setup_data);
6735         if (IS_ERR(task))
6736                 return PTR_ERR(task);
6737         if (!issync)
6738                 goto out;
6739         status = rpc_wait_for_completion_task(task);
6740         if (status != 0)
6741                 goto out;
6742         status = data->rpc_status;
6743 out:
6744         rpc_put_task(task);
6745         return status;
6746 }
6747
6748 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6749 {
6750         struct nfs_server *server = NFS_SERVER(inode);
6751         struct nfs4_exception exception = { };
6752         int err;
6753         do {
6754                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6755                 trace_nfs4_delegreturn(inode, stateid, err);
6756                 switch (err) {
6757                         case -NFS4ERR_STALE_STATEID:
6758                         case -NFS4ERR_EXPIRED:
6759                         case 0:
6760                                 return 0;
6761                 }
6762                 err = nfs4_handle_exception(server, err, &exception);
6763         } while (exception.retry);
6764         return err;
6765 }
6766
6767 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6768 {
6769         struct inode *inode = state->inode;
6770         struct nfs_server *server = NFS_SERVER(inode);
6771         struct nfs_client *clp = server->nfs_client;
6772         struct nfs_lockt_args arg = {
6773                 .fh = NFS_FH(inode),
6774                 .fl = request,
6775         };
6776         struct nfs_lockt_res res = {
6777                 .denied = request,
6778         };
6779         struct rpc_message msg = {
6780                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6781                 .rpc_argp       = &arg,
6782                 .rpc_resp       = &res,
6783                 .rpc_cred       = state->owner->so_cred,
6784         };
6785         struct nfs4_lock_state *lsp;
6786         int status;
6787
6788         arg.lock_owner.clientid = clp->cl_clientid;
6789         status = nfs4_set_lock_state(state, request);
6790         if (status != 0)
6791                 goto out;
6792         lsp = request->fl_u.nfs4_fl.owner;
6793         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6794         arg.lock_owner.s_dev = server->s_dev;
6795         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6796         switch (status) {
6797                 case 0:
6798                         request->c.flc_type = F_UNLCK;
6799                         break;
6800                 case -NFS4ERR_DENIED:
6801                         status = 0;
6802         }
6803         request->fl_ops->fl_release_private(request);
6804         request->fl_ops = NULL;
6805 out:
6806         return status;
6807 }
6808
6809 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6810 {
6811         struct nfs4_exception exception = {
6812                 .interruptible = true,
6813         };
6814         int err;
6815
6816         do {
6817                 err = _nfs4_proc_getlk(state, cmd, request);
6818                 trace_nfs4_get_lock(request, state, cmd, err);
6819                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6820                                 &exception);
6821         } while (exception.retry);
6822         return err;
6823 }
6824
6825 /*
6826  * Update the seqid of a lock stateid after receiving
6827  * NFS4ERR_OLD_STATEID
6828  */
6829 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6830                 struct nfs4_lock_state *lsp)
6831 {
6832         struct nfs4_state *state = lsp->ls_state;
6833         bool ret = false;
6834
6835         spin_lock(&state->state_lock);
6836         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6837                 goto out;
6838         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6839                 nfs4_stateid_seqid_inc(dst);
6840         else
6841                 dst->seqid = lsp->ls_stateid.seqid;
6842         ret = true;
6843 out:
6844         spin_unlock(&state->state_lock);
6845         return ret;
6846 }
6847
6848 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6849                 struct nfs4_lock_state *lsp)
6850 {
6851         struct nfs4_state *state = lsp->ls_state;
6852         bool ret;
6853
6854         spin_lock(&state->state_lock);
6855         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6856         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6857         spin_unlock(&state->state_lock);
6858         return ret;
6859 }
6860
6861 struct nfs4_unlockdata {
6862         struct nfs_locku_args arg;
6863         struct nfs_locku_res res;
6864         struct nfs4_lock_state *lsp;
6865         struct nfs_open_context *ctx;
6866         struct nfs_lock_context *l_ctx;
6867         struct file_lock fl;
6868         struct nfs_server *server;
6869         unsigned long timestamp;
6870 };
6871
6872 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6873                 struct nfs_open_context *ctx,
6874                 struct nfs4_lock_state *lsp,
6875                 struct nfs_seqid *seqid)
6876 {
6877         struct nfs4_unlockdata *p;
6878         struct nfs4_state *state = lsp->ls_state;
6879         struct inode *inode = state->inode;
6880
6881         p = kzalloc(sizeof(*p), GFP_KERNEL);
6882         if (p == NULL)
6883                 return NULL;
6884         p->arg.fh = NFS_FH(inode);
6885         p->arg.fl = &p->fl;
6886         p->arg.seqid = seqid;
6887         p->res.seqid = seqid;
6888         p->lsp = lsp;
6889         /* Ensure we don't close file until we're done freeing locks! */
6890         p->ctx = get_nfs_open_context(ctx);
6891         p->l_ctx = nfs_get_lock_context(ctx);
6892         locks_init_lock(&p->fl);
6893         locks_copy_lock(&p->fl, fl);
6894         p->server = NFS_SERVER(inode);
6895         spin_lock(&state->state_lock);
6896         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6897         spin_unlock(&state->state_lock);
6898         return p;
6899 }
6900
6901 static void nfs4_locku_release_calldata(void *data)
6902 {
6903         struct nfs4_unlockdata *calldata = data;
6904         nfs_free_seqid(calldata->arg.seqid);
6905         nfs4_put_lock_state(calldata->lsp);
6906         nfs_put_lock_context(calldata->l_ctx);
6907         put_nfs_open_context(calldata->ctx);
6908         kfree(calldata);
6909 }
6910
6911 static void nfs4_locku_done(struct rpc_task *task, void *data)
6912 {
6913         struct nfs4_unlockdata *calldata = data;
6914         struct nfs4_exception exception = {
6915                 .inode = calldata->lsp->ls_state->inode,
6916                 .stateid = &calldata->arg.stateid,
6917         };
6918
6919         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6920                 return;
6921         switch (task->tk_status) {
6922                 case 0:
6923                         renew_lease(calldata->server, calldata->timestamp);
6924                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6925                         if (nfs4_update_lock_stateid(calldata->lsp,
6926                                         &calldata->res.stateid))
6927                                 break;
6928                         fallthrough;
6929                 case -NFS4ERR_ADMIN_REVOKED:
6930                 case -NFS4ERR_EXPIRED:
6931                         nfs4_free_revoked_stateid(calldata->server,
6932                                         &calldata->arg.stateid,
6933                                         task->tk_msg.rpc_cred);
6934                         fallthrough;
6935                 case -NFS4ERR_BAD_STATEID:
6936                 case -NFS4ERR_STALE_STATEID:
6937                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6938                                                 calldata->lsp))
6939                                 rpc_restart_call_prepare(task);
6940                         break;
6941                 case -NFS4ERR_OLD_STATEID:
6942                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6943                                                 calldata->lsp))
6944                                 rpc_restart_call_prepare(task);
6945                         break;
6946                 default:
6947                         task->tk_status = nfs4_async_handle_exception(task,
6948                                         calldata->server, task->tk_status,
6949                                         &exception);
6950                         if (exception.retry)
6951                                 rpc_restart_call_prepare(task);
6952         }
6953         nfs_release_seqid(calldata->arg.seqid);
6954 }
6955
6956 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6957 {
6958         struct nfs4_unlockdata *calldata = data;
6959
6960         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6961                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6962                 return;
6963
6964         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6965                 goto out_wait;
6966         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6967                 /* Note: exit _without_ running nfs4_locku_done */
6968                 goto out_no_action;
6969         }
6970         calldata->timestamp = jiffies;
6971         if (nfs4_setup_sequence(calldata->server->nfs_client,
6972                                 &calldata->arg.seq_args,
6973                                 &calldata->res.seq_res,
6974                                 task) != 0)
6975                 nfs_release_seqid(calldata->arg.seqid);
6976         return;
6977 out_no_action:
6978         task->tk_action = NULL;
6979 out_wait:
6980         nfs4_sequence_done(task, &calldata->res.seq_res);
6981 }
6982
6983 static const struct rpc_call_ops nfs4_locku_ops = {
6984         .rpc_call_prepare = nfs4_locku_prepare,
6985         .rpc_call_done = nfs4_locku_done,
6986         .rpc_release = nfs4_locku_release_calldata,
6987 };
6988
6989 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6990                 struct nfs_open_context *ctx,
6991                 struct nfs4_lock_state *lsp,
6992                 struct nfs_seqid *seqid)
6993 {
6994         struct nfs4_unlockdata *data;
6995         struct rpc_message msg = {
6996                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6997                 .rpc_cred = ctx->cred,
6998         };
6999         struct rpc_task_setup task_setup_data = {
7000                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
7001                 .rpc_message = &msg,
7002                 .callback_ops = &nfs4_locku_ops,
7003                 .workqueue = nfsiod_workqueue,
7004                 .flags = RPC_TASK_ASYNC,
7005         };
7006
7007         if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
7008                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7009
7010         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
7011                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
7012
7013         /* Ensure this is an unlock - when canceling a lock, the
7014          * canceled lock is passed in, and it won't be an unlock.
7015          */
7016         fl->c.flc_type = F_UNLCK;
7017         if (fl->c.flc_flags & FL_CLOSE)
7018                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
7019
7020         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7021         if (data == NULL) {
7022                 nfs_free_seqid(seqid);
7023                 return ERR_PTR(-ENOMEM);
7024         }
7025
7026         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7027         msg.rpc_argp = &data->arg;
7028         msg.rpc_resp = &data->res;
7029         task_setup_data.callback_data = data;
7030         return rpc_run_task(&task_setup_data);
7031 }
7032
7033 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7034 {
7035         struct inode *inode = state->inode;
7036         struct nfs4_state_owner *sp = state->owner;
7037         struct nfs_inode *nfsi = NFS_I(inode);
7038         struct nfs_seqid *seqid;
7039         struct nfs4_lock_state *lsp;
7040         struct rpc_task *task;
7041         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7042         int status = 0;
7043         unsigned char saved_flags = request->c.flc_flags;
7044
7045         status = nfs4_set_lock_state(state, request);
7046         /* Unlock _before_ we do the RPC call */
7047         request->c.flc_flags |= FL_EXISTS;
7048         /* Exclude nfs_delegation_claim_locks() */
7049         mutex_lock(&sp->so_delegreturn_mutex);
7050         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7051         down_read(&nfsi->rwsem);
7052         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7053                 up_read(&nfsi->rwsem);
7054                 mutex_unlock(&sp->so_delegreturn_mutex);
7055                 goto out;
7056         }
7057         lsp = request->fl_u.nfs4_fl.owner;
7058         set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7059         up_read(&nfsi->rwsem);
7060         mutex_unlock(&sp->so_delegreturn_mutex);
7061         if (status != 0)
7062                 goto out;
7063         /* Is this a delegated lock? */
7064         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7065                 goto out;
7066         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7067         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7068         status = -ENOMEM;
7069         if (IS_ERR(seqid))
7070                 goto out;
7071         task = nfs4_do_unlck(request,
7072                              nfs_file_open_context(request->c.flc_file),
7073                              lsp, seqid);
7074         status = PTR_ERR(task);
7075         if (IS_ERR(task))
7076                 goto out;
7077         status = rpc_wait_for_completion_task(task);
7078         rpc_put_task(task);
7079 out:
7080         request->c.flc_flags = saved_flags;
7081         trace_nfs4_unlock(request, state, F_SETLK, status);
7082         return status;
7083 }
7084
7085 struct nfs4_lockdata {
7086         struct nfs_lock_args arg;
7087         struct nfs_lock_res res;
7088         struct nfs4_lock_state *lsp;
7089         struct nfs_open_context *ctx;
7090         struct file_lock fl;
7091         unsigned long timestamp;
7092         int rpc_status;
7093         int cancelled;
7094         struct nfs_server *server;
7095 };
7096
7097 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7098                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7099                 gfp_t gfp_mask)
7100 {
7101         struct nfs4_lockdata *p;
7102         struct inode *inode = lsp->ls_state->inode;
7103         struct nfs_server *server = NFS_SERVER(inode);
7104         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7105
7106         p = kzalloc(sizeof(*p), gfp_mask);
7107         if (p == NULL)
7108                 return NULL;
7109
7110         p->arg.fh = NFS_FH(inode);
7111         p->arg.fl = &p->fl;
7112         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7113         if (IS_ERR(p->arg.open_seqid))
7114                 goto out_free;
7115         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7116         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7117         if (IS_ERR(p->arg.lock_seqid))
7118                 goto out_free_seqid;
7119         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7120         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7121         p->arg.lock_owner.s_dev = server->s_dev;
7122         p->res.lock_seqid = p->arg.lock_seqid;
7123         p->lsp = lsp;
7124         p->server = server;
7125         p->ctx = get_nfs_open_context(ctx);
7126         locks_init_lock(&p->fl);
7127         locks_copy_lock(&p->fl, fl);
7128         return p;
7129 out_free_seqid:
7130         nfs_free_seqid(p->arg.open_seqid);
7131 out_free:
7132         kfree(p);
7133         return NULL;
7134 }
7135
7136 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7137 {
7138         struct nfs4_lockdata *data = calldata;
7139         struct nfs4_state *state = data->lsp->ls_state;
7140
7141         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7142                 goto out_wait;
7143         /* Do we need to do an open_to_lock_owner? */
7144         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7145                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7146                         goto out_release_lock_seqid;
7147                 }
7148                 nfs4_stateid_copy(&data->arg.open_stateid,
7149                                 &state->open_stateid);
7150                 data->arg.new_lock_owner = 1;
7151                 data->res.open_seqid = data->arg.open_seqid;
7152         } else {
7153                 data->arg.new_lock_owner = 0;
7154                 nfs4_stateid_copy(&data->arg.lock_stateid,
7155                                 &data->lsp->ls_stateid);
7156         }
7157         if (!nfs4_valid_open_stateid(state)) {
7158                 data->rpc_status = -EBADF;
7159                 task->tk_action = NULL;
7160                 goto out_release_open_seqid;
7161         }
7162         data->timestamp = jiffies;
7163         if (nfs4_setup_sequence(data->server->nfs_client,
7164                                 &data->arg.seq_args,
7165                                 &data->res.seq_res,
7166                                 task) == 0)
7167                 return;
7168 out_release_open_seqid:
7169         nfs_release_seqid(data->arg.open_seqid);
7170 out_release_lock_seqid:
7171         nfs_release_seqid(data->arg.lock_seqid);
7172 out_wait:
7173         nfs4_sequence_done(task, &data->res.seq_res);
7174         dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7175 }
7176
7177 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7178 {
7179         struct nfs4_lockdata *data = calldata;
7180         struct nfs4_lock_state *lsp = data->lsp;
7181
7182         if (!nfs4_sequence_done(task, &data->res.seq_res))
7183                 return;
7184
7185         data->rpc_status = task->tk_status;
7186         switch (task->tk_status) {
7187         case 0:
7188                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7189                                 data->timestamp);
7190                 if (data->arg.new_lock && !data->cancelled) {
7191                         data->fl.c.flc_flags &= ~(FL_SLEEP | FL_ACCESS);
7192                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7193                                 goto out_restart;
7194                 }
7195                 if (data->arg.new_lock_owner != 0) {
7196                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
7197                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7198                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7199                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7200                         goto out_restart;
7201                 break;
7202         case -NFS4ERR_OLD_STATEID:
7203                 if (data->arg.new_lock_owner != 0 &&
7204                         nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7205                                         lsp->ls_state))
7206                         goto out_restart;
7207                 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7208                         goto out_restart;
7209                 fallthrough;
7210         case -NFS4ERR_BAD_STATEID:
7211         case -NFS4ERR_STALE_STATEID:
7212         case -NFS4ERR_EXPIRED:
7213                 if (data->arg.new_lock_owner != 0) {
7214                         if (!nfs4_stateid_match(&data->arg.open_stateid,
7215                                                 &lsp->ls_state->open_stateid))
7216                                 goto out_restart;
7217                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7218                                                 &lsp->ls_stateid))
7219                                 goto out_restart;
7220         }
7221 out_done:
7222         dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7223         return;
7224 out_restart:
7225         if (!data->cancelled)
7226                 rpc_restart_call_prepare(task);
7227         goto out_done;
7228 }
7229
7230 static void nfs4_lock_release(void *calldata)
7231 {
7232         struct nfs4_lockdata *data = calldata;
7233
7234         nfs_free_seqid(data->arg.open_seqid);
7235         if (data->cancelled && data->rpc_status == 0) {
7236                 struct rpc_task *task;
7237                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7238                                 data->arg.lock_seqid);
7239                 if (!IS_ERR(task))
7240                         rpc_put_task_async(task);
7241                 dprintk("%s: cancelling lock!\n", __func__);
7242         } else
7243                 nfs_free_seqid(data->arg.lock_seqid);
7244         nfs4_put_lock_state(data->lsp);
7245         put_nfs_open_context(data->ctx);
7246         kfree(data);
7247 }
7248
7249 static const struct rpc_call_ops nfs4_lock_ops = {
7250         .rpc_call_prepare = nfs4_lock_prepare,
7251         .rpc_call_done = nfs4_lock_done,
7252         .rpc_release = nfs4_lock_release,
7253 };
7254
7255 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7256 {
7257         switch (error) {
7258         case -NFS4ERR_ADMIN_REVOKED:
7259         case -NFS4ERR_EXPIRED:
7260         case -NFS4ERR_BAD_STATEID:
7261                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7262                 if (new_lock_owner != 0 ||
7263                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7264                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7265                 break;
7266         case -NFS4ERR_STALE_STATEID:
7267                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7268                 nfs4_schedule_lease_recovery(server->nfs_client);
7269         }
7270 }
7271
7272 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7273 {
7274         struct nfs4_lockdata *data;
7275         struct rpc_task *task;
7276         struct rpc_message msg = {
7277                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7278                 .rpc_cred = state->owner->so_cred,
7279         };
7280         struct rpc_task_setup task_setup_data = {
7281                 .rpc_client = NFS_CLIENT(state->inode),
7282                 .rpc_message = &msg,
7283                 .callback_ops = &nfs4_lock_ops,
7284                 .workqueue = nfsiod_workqueue,
7285                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7286         };
7287         int ret;
7288
7289         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7290                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7291
7292         data = nfs4_alloc_lockdata(fl,
7293                                    nfs_file_open_context(fl->c.flc_file),
7294                                    fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7295         if (data == NULL)
7296                 return -ENOMEM;
7297         if (IS_SETLKW(cmd))
7298                 data->arg.block = 1;
7299         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7300                                 recovery_type > NFS_LOCK_NEW);
7301         msg.rpc_argp = &data->arg;
7302         msg.rpc_resp = &data->res;
7303         task_setup_data.callback_data = data;
7304         if (recovery_type > NFS_LOCK_NEW) {
7305                 if (recovery_type == NFS_LOCK_RECLAIM)
7306                         data->arg.reclaim = NFS_LOCK_RECLAIM;
7307         } else
7308                 data->arg.new_lock = 1;
7309         task = rpc_run_task(&task_setup_data);
7310         if (IS_ERR(task))
7311                 return PTR_ERR(task);
7312         ret = rpc_wait_for_completion_task(task);
7313         if (ret == 0) {
7314                 ret = data->rpc_status;
7315                 if (ret)
7316                         nfs4_handle_setlk_error(data->server, data->lsp,
7317                                         data->arg.new_lock_owner, ret);
7318         } else
7319                 data->cancelled = true;
7320         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7321         rpc_put_task(task);
7322         dprintk("%s: ret = %d\n", __func__, ret);
7323         return ret;
7324 }
7325
7326 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7327 {
7328         struct nfs_server *server = NFS_SERVER(state->inode);
7329         struct nfs4_exception exception = {
7330                 .inode = state->inode,
7331         };
7332         int err;
7333
7334         do {
7335                 /* Cache the lock if possible... */
7336                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7337                         return 0;
7338                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7339                 if (err != -NFS4ERR_DELAY)
7340                         break;
7341                 nfs4_handle_exception(server, err, &exception);
7342         } while (exception.retry);
7343         return err;
7344 }
7345
7346 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7347 {
7348         struct nfs_server *server = NFS_SERVER(state->inode);
7349         struct nfs4_exception exception = {
7350                 .inode = state->inode,
7351         };
7352         int err;
7353
7354         err = nfs4_set_lock_state(state, request);
7355         if (err != 0)
7356                 return err;
7357         if (!recover_lost_locks) {
7358                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7359                 return 0;
7360         }
7361         do {
7362                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7363                         return 0;
7364                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7365                 switch (err) {
7366                 default:
7367                         goto out;
7368                 case -NFS4ERR_GRACE:
7369                 case -NFS4ERR_DELAY:
7370                         nfs4_handle_exception(server, err, &exception);
7371                         err = 0;
7372                 }
7373         } while (exception.retry);
7374 out:
7375         return err;
7376 }
7377
7378 #if defined(CONFIG_NFS_V4_1)
7379 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7380 {
7381         struct nfs4_lock_state *lsp;
7382         int status;
7383
7384         status = nfs4_set_lock_state(state, request);
7385         if (status != 0)
7386                 return status;
7387         lsp = request->fl_u.nfs4_fl.owner;
7388         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7389             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7390                 return 0;
7391         return nfs4_lock_expired(state, request);
7392 }
7393 #endif
7394
7395 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7396 {
7397         struct nfs_inode *nfsi = NFS_I(state->inode);
7398         struct nfs4_state_owner *sp = state->owner;
7399         unsigned char flags = request->c.flc_flags;
7400         int status;
7401
7402         request->c.flc_flags |= FL_ACCESS;
7403         status = locks_lock_inode_wait(state->inode, request);
7404         if (status < 0)
7405                 goto out;
7406         mutex_lock(&sp->so_delegreturn_mutex);
7407         down_read(&nfsi->rwsem);
7408         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7409                 /* Yes: cache locks! */
7410                 /* ...but avoid races with delegation recall... */
7411                 request->c.flc_flags = flags & ~FL_SLEEP;
7412                 status = locks_lock_inode_wait(state->inode, request);
7413                 up_read(&nfsi->rwsem);
7414                 mutex_unlock(&sp->so_delegreturn_mutex);
7415                 goto out;
7416         }
7417         up_read(&nfsi->rwsem);
7418         mutex_unlock(&sp->so_delegreturn_mutex);
7419         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7420 out:
7421         request->c.flc_flags = flags;
7422         return status;
7423 }
7424
7425 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7426 {
7427         struct nfs4_exception exception = {
7428                 .state = state,
7429                 .inode = state->inode,
7430                 .interruptible = true,
7431         };
7432         int err;
7433
7434         do {
7435                 err = _nfs4_proc_setlk(state, cmd, request);
7436                 if (err == -NFS4ERR_DENIED)
7437                         err = -EAGAIN;
7438                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7439                                 err, &exception);
7440         } while (exception.retry);
7441         return err;
7442 }
7443
7444 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7445 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7446
7447 static int
7448 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7449                         struct file_lock *request)
7450 {
7451         int             status = -ERESTARTSYS;
7452         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7453
7454         while(!signalled()) {
7455                 status = nfs4_proc_setlk(state, cmd, request);
7456                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7457                         break;
7458                 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7459                 schedule_timeout(timeout);
7460                 timeout *= 2;
7461                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7462                 status = -ERESTARTSYS;
7463         }
7464         return status;
7465 }
7466
7467 #ifdef CONFIG_NFS_V4_1
7468 struct nfs4_lock_waiter {
7469         struct inode            *inode;
7470         struct nfs_lowner       owner;
7471         wait_queue_entry_t      wait;
7472 };
7473
7474 static int
7475 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7476 {
7477         struct nfs4_lock_waiter *waiter =
7478                 container_of(wait, struct nfs4_lock_waiter, wait);
7479
7480         /* NULL key means to wake up everyone */
7481         if (key) {
7482                 struct cb_notify_lock_args      *cbnl = key;
7483                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7484                                                 *wowner = &waiter->owner;
7485
7486                 /* Only wake if the callback was for the same owner. */
7487                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7488                         return 0;
7489
7490                 /* Make sure it's for the right inode */
7491                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7492                         return 0;
7493         }
7494
7495         return woken_wake_function(wait, mode, flags, key);
7496 }
7497
7498 static int
7499 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7500 {
7501         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7502         struct nfs_server *server = NFS_SERVER(state->inode);
7503         struct nfs_client *clp = server->nfs_client;
7504         wait_queue_head_t *q = &clp->cl_lock_waitq;
7505         struct nfs4_lock_waiter waiter = {
7506                 .inode = state->inode,
7507                 .owner = { .clientid = clp->cl_clientid,
7508                            .id = lsp->ls_seqid.owner_id,
7509                            .s_dev = server->s_dev },
7510         };
7511         int status;
7512
7513         /* Don't bother with waitqueue if we don't expect a callback */
7514         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7515                 return nfs4_retry_setlk_simple(state, cmd, request);
7516
7517         init_wait(&waiter.wait);
7518         waiter.wait.func = nfs4_wake_lock_waiter;
7519         add_wait_queue(q, &waiter.wait);
7520
7521         do {
7522                 status = nfs4_proc_setlk(state, cmd, request);
7523                 if (status != -EAGAIN || IS_SETLK(cmd))
7524                         break;
7525
7526                 status = -ERESTARTSYS;
7527                 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7528                            NFS4_LOCK_MAXTIMEOUT);
7529         } while (!signalled());
7530
7531         remove_wait_queue(q, &waiter.wait);
7532
7533         return status;
7534 }
7535 #else /* !CONFIG_NFS_V4_1 */
7536 static inline int
7537 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7538 {
7539         return nfs4_retry_setlk_simple(state, cmd, request);
7540 }
7541 #endif
7542
7543 static int
7544 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7545 {
7546         struct nfs_open_context *ctx;
7547         struct nfs4_state *state;
7548         int status;
7549
7550         /* verify open state */
7551         ctx = nfs_file_open_context(filp);
7552         state = ctx->state;
7553
7554         if (IS_GETLK(cmd)) {
7555                 if (state != NULL)
7556                         return nfs4_proc_getlk(state, F_GETLK, request);
7557                 return 0;
7558         }
7559
7560         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7561                 return -EINVAL;
7562
7563         if (lock_is_unlock(request)) {
7564                 if (state != NULL)
7565                         return nfs4_proc_unlck(state, cmd, request);
7566                 return 0;
7567         }
7568
7569         if (state == NULL)
7570                 return -ENOLCK;
7571
7572         if ((request->c.flc_flags & FL_POSIX) &&
7573             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7574                 return -ENOLCK;
7575
7576         /*
7577          * Don't rely on the VFS having checked the file open mode,
7578          * since it won't do this for flock() locks.
7579          */
7580         switch (request->c.flc_type) {
7581         case F_RDLCK:
7582                 if (!(filp->f_mode & FMODE_READ))
7583                         return -EBADF;
7584                 break;
7585         case F_WRLCK:
7586                 if (!(filp->f_mode & FMODE_WRITE))
7587                         return -EBADF;
7588         }
7589
7590         status = nfs4_set_lock_state(state, request);
7591         if (status != 0)
7592                 return status;
7593
7594         return nfs4_retry_setlk(state, cmd, request);
7595 }
7596
7597 static int nfs4_delete_lease(struct file *file, void **priv)
7598 {
7599         return generic_setlease(file, F_UNLCK, NULL, priv);
7600 }
7601
7602 static int nfs4_add_lease(struct file *file, int arg, struct file_lease **lease,
7603                           void **priv)
7604 {
7605         struct inode *inode = file_inode(file);
7606         fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7607         int ret;
7608
7609         /* No delegation, no lease */
7610         if (!nfs4_have_delegation(inode, type))
7611                 return -EAGAIN;
7612         ret = generic_setlease(file, arg, lease, priv);
7613         if (ret || nfs4_have_delegation(inode, type))
7614                 return ret;
7615         /* We raced with a delegation return */
7616         nfs4_delete_lease(file, priv);
7617         return -EAGAIN;
7618 }
7619
7620 int nfs4_proc_setlease(struct file *file, int arg, struct file_lease **lease,
7621                        void **priv)
7622 {
7623         switch (arg) {
7624         case F_RDLCK:
7625         case F_WRLCK:
7626                 return nfs4_add_lease(file, arg, lease, priv);
7627         case F_UNLCK:
7628                 return nfs4_delete_lease(file, priv);
7629         default:
7630                 return -EINVAL;
7631         }
7632 }
7633
7634 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7635 {
7636         struct nfs_server *server = NFS_SERVER(state->inode);
7637         int err;
7638
7639         err = nfs4_set_lock_state(state, fl);
7640         if (err != 0)
7641                 return err;
7642         do {
7643                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7644                 if (err != -NFS4ERR_DELAY)
7645                         break;
7646                 ssleep(1);
7647         } while (err == -NFS4ERR_DELAY);
7648         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7649 }
7650
7651 struct nfs_release_lockowner_data {
7652         struct nfs4_lock_state *lsp;
7653         struct nfs_server *server;
7654         struct nfs_release_lockowner_args args;
7655         struct nfs_release_lockowner_res res;
7656         unsigned long timestamp;
7657 };
7658
7659 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7660 {
7661         struct nfs_release_lockowner_data *data = calldata;
7662         struct nfs_server *server = data->server;
7663         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7664                            &data->res.seq_res, task);
7665         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7666         data->timestamp = jiffies;
7667 }
7668
7669 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7670 {
7671         struct nfs_release_lockowner_data *data = calldata;
7672         struct nfs_server *server = data->server;
7673
7674         nfs40_sequence_done(task, &data->res.seq_res);
7675
7676         switch (task->tk_status) {
7677         case 0:
7678                 renew_lease(server, data->timestamp);
7679                 break;
7680         case -NFS4ERR_STALE_CLIENTID:
7681         case -NFS4ERR_EXPIRED:
7682                 nfs4_schedule_lease_recovery(server->nfs_client);
7683                 break;
7684         case -NFS4ERR_LEASE_MOVED:
7685         case -NFS4ERR_DELAY:
7686                 if (nfs4_async_handle_error(task, server,
7687                                             NULL, NULL) == -EAGAIN)
7688                         rpc_restart_call_prepare(task);
7689         }
7690 }
7691
7692 static void nfs4_release_lockowner_release(void *calldata)
7693 {
7694         struct nfs_release_lockowner_data *data = calldata;
7695         nfs4_free_lock_state(data->server, data->lsp);
7696         kfree(calldata);
7697 }
7698
7699 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7700         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7701         .rpc_call_done = nfs4_release_lockowner_done,
7702         .rpc_release = nfs4_release_lockowner_release,
7703 };
7704
7705 static void
7706 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7707 {
7708         struct nfs_release_lockowner_data *data;
7709         struct rpc_message msg = {
7710                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7711         };
7712
7713         if (server->nfs_client->cl_mvops->minor_version != 0)
7714                 return;
7715
7716         data = kmalloc(sizeof(*data), GFP_KERNEL);
7717         if (!data)
7718                 return;
7719         data->lsp = lsp;
7720         data->server = server;
7721         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7722         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7723         data->args.lock_owner.s_dev = server->s_dev;
7724
7725         msg.rpc_argp = &data->args;
7726         msg.rpc_resp = &data->res;
7727         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7728         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7729 }
7730
7731 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7732
7733 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7734                                    struct mnt_idmap *idmap,
7735                                    struct dentry *unused, struct inode *inode,
7736                                    const char *key, const void *buf,
7737                                    size_t buflen, int flags)
7738 {
7739         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7740 }
7741
7742 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7743                                    struct dentry *unused, struct inode *inode,
7744                                    const char *key, void *buf, size_t buflen)
7745 {
7746         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7747 }
7748
7749 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7750 {
7751         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7752 }
7753
7754 #if defined(CONFIG_NFS_V4_1)
7755 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7756
7757 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7758                                     struct mnt_idmap *idmap,
7759                                     struct dentry *unused, struct inode *inode,
7760                                     const char *key, const void *buf,
7761                                     size_t buflen, int flags)
7762 {
7763         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7764 }
7765
7766 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7767                                     struct dentry *unused, struct inode *inode,
7768                                     const char *key, void *buf, size_t buflen)
7769 {
7770         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7771 }
7772
7773 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7774 {
7775         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7776 }
7777
7778 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7779
7780 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7781                                     struct mnt_idmap *idmap,
7782                                     struct dentry *unused, struct inode *inode,
7783                                     const char *key, const void *buf,
7784                                     size_t buflen, int flags)
7785 {
7786         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7787 }
7788
7789 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7790                                     struct dentry *unused, struct inode *inode,
7791                                     const char *key, void *buf, size_t buflen)
7792 {
7793         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7794 }
7795
7796 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7797 {
7798         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7799 }
7800
7801 #endif
7802
7803 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7804
7805 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7806                                      struct mnt_idmap *idmap,
7807                                      struct dentry *unused, struct inode *inode,
7808                                      const char *key, const void *buf,
7809                                      size_t buflen, int flags)
7810 {
7811         if (security_ismaclabel(key))
7812                 return nfs4_set_security_label(inode, buf, buflen);
7813
7814         return -EOPNOTSUPP;
7815 }
7816
7817 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7818                                      struct dentry *unused, struct inode *inode,
7819                                      const char *key, void *buf, size_t buflen)
7820 {
7821         if (security_ismaclabel(key))
7822                 return nfs4_get_security_label(inode, buf, buflen);
7823         return -EOPNOTSUPP;
7824 }
7825
7826 static ssize_t
7827 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7828 {
7829         int len = 0;
7830
7831         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7832                 len = security_inode_listsecurity(inode, list, list_len);
7833                 if (len >= 0 && list_len && len > list_len)
7834                         return -ERANGE;
7835         }
7836         return len;
7837 }
7838
7839 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7840         .prefix = XATTR_SECURITY_PREFIX,
7841         .get    = nfs4_xattr_get_nfs4_label,
7842         .set    = nfs4_xattr_set_nfs4_label,
7843 };
7844
7845 #else
7846
7847 static ssize_t
7848 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7849 {
7850         return 0;
7851 }
7852
7853 #endif
7854
7855 #ifdef CONFIG_NFS_V4_2
7856 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7857                                     struct mnt_idmap *idmap,
7858                                     struct dentry *unused, struct inode *inode,
7859                                     const char *key, const void *buf,
7860                                     size_t buflen, int flags)
7861 {
7862         u32 mask;
7863         int ret;
7864
7865         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7866                 return -EOPNOTSUPP;
7867
7868         /*
7869          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7870          * flags right now. Handling of xattr operations use the normal
7871          * file read/write permissions.
7872          *
7873          * Just in case the server has other ideas (which RFC 8276 allows),
7874          * do a cached access check for the XA* flags to possibly avoid
7875          * doing an RPC and getting EACCES back.
7876          */
7877         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7878                 if (!(mask & NFS_ACCESS_XAWRITE))
7879                         return -EACCES;
7880         }
7881
7882         if (buf == NULL) {
7883                 ret = nfs42_proc_removexattr(inode, key);
7884                 if (!ret)
7885                         nfs4_xattr_cache_remove(inode, key);
7886         } else {
7887                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7888                 if (!ret)
7889                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7890         }
7891
7892         return ret;
7893 }
7894
7895 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7896                                     struct dentry *unused, struct inode *inode,
7897                                     const char *key, void *buf, size_t buflen)
7898 {
7899         u32 mask;
7900         ssize_t ret;
7901
7902         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7903                 return -EOPNOTSUPP;
7904
7905         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7906                 if (!(mask & NFS_ACCESS_XAREAD))
7907                         return -EACCES;
7908         }
7909
7910         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7911         if (ret)
7912                 return ret;
7913
7914         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7915         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7916                 return ret;
7917
7918         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7919
7920         return ret;
7921 }
7922
7923 static ssize_t
7924 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7925 {
7926         u64 cookie;
7927         bool eof;
7928         ssize_t ret, size;
7929         char *buf;
7930         size_t buflen;
7931         u32 mask;
7932
7933         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7934                 return 0;
7935
7936         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7937                 if (!(mask & NFS_ACCESS_XALIST))
7938                         return 0;
7939         }
7940
7941         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7942         if (ret)
7943                 return ret;
7944
7945         ret = nfs4_xattr_cache_list(inode, list, list_len);
7946         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7947                 return ret;
7948
7949         cookie = 0;
7950         eof = false;
7951         buflen = list_len ? list_len : XATTR_LIST_MAX;
7952         buf = list_len ? list : NULL;
7953         size = 0;
7954
7955         while (!eof) {
7956                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7957                     &cookie, &eof);
7958                 if (ret < 0)
7959                         return ret;
7960
7961                 if (list_len) {
7962                         buf += ret;
7963                         buflen -= ret;
7964                 }
7965                 size += ret;
7966         }
7967
7968         if (list_len)
7969                 nfs4_xattr_cache_set_list(inode, list, size);
7970
7971         return size;
7972 }
7973
7974 #else
7975
7976 static ssize_t
7977 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7978 {
7979         return 0;
7980 }
7981 #endif /* CONFIG_NFS_V4_2 */
7982
7983 /*
7984  * nfs_fhget will use either the mounted_on_fileid or the fileid
7985  */
7986 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7987 {
7988         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7989                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7990               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7991               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7992                 return;
7993
7994         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7995                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7996         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7997         fattr->nlink = 2;
7998 }
7999
8000 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8001                                    const struct qstr *name,
8002                                    struct nfs4_fs_locations *fs_locations,
8003                                    struct page *page)
8004 {
8005         struct nfs_server *server = NFS_SERVER(dir);
8006         u32 bitmask[3];
8007         struct nfs4_fs_locations_arg args = {
8008                 .dir_fh = NFS_FH(dir),
8009                 .name = name,
8010                 .page = page,
8011                 .bitmask = bitmask,
8012         };
8013         struct nfs4_fs_locations_res res = {
8014                 .fs_locations = fs_locations,
8015         };
8016         struct rpc_message msg = {
8017                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8018                 .rpc_argp = &args,
8019                 .rpc_resp = &res,
8020         };
8021         int status;
8022
8023         dprintk("%s: start\n", __func__);
8024
8025         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8026         bitmask[1] = nfs4_fattr_bitmap[1];
8027
8028         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8029          * is not supported */
8030         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8031                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8032         else
8033                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8034
8035         nfs_fattr_init(fs_locations->fattr);
8036         fs_locations->server = server;
8037         fs_locations->nlocations = 0;
8038         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8039         dprintk("%s: returned status = %d\n", __func__, status);
8040         return status;
8041 }
8042
8043 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8044                            const struct qstr *name,
8045                            struct nfs4_fs_locations *fs_locations,
8046                            struct page *page)
8047 {
8048         struct nfs4_exception exception = {
8049                 .interruptible = true,
8050         };
8051         int err;
8052         do {
8053                 err = _nfs4_proc_fs_locations(client, dir, name,
8054                                 fs_locations, page);
8055                 trace_nfs4_get_fs_locations(dir, name, err);
8056                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8057                                 &exception);
8058         } while (exception.retry);
8059         return err;
8060 }
8061
8062 /*
8063  * This operation also signals the server that this client is
8064  * performing migration recovery.  The server can stop returning
8065  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8066  * appended to this compound to identify the client ID which is
8067  * performing recovery.
8068  */
8069 static int _nfs40_proc_get_locations(struct nfs_server *server,
8070                                      struct nfs_fh *fhandle,
8071                                      struct nfs4_fs_locations *locations,
8072                                      struct page *page, const struct cred *cred)
8073 {
8074         struct rpc_clnt *clnt = server->client;
8075         u32 bitmask[2] = {
8076                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8077         };
8078         struct nfs4_fs_locations_arg args = {
8079                 .clientid       = server->nfs_client->cl_clientid,
8080                 .fh             = fhandle,
8081                 .page           = page,
8082                 .bitmask        = bitmask,
8083                 .migration      = 1,            /* skip LOOKUP */
8084                 .renew          = 1,            /* append RENEW */
8085         };
8086         struct nfs4_fs_locations_res res = {
8087                 .fs_locations   = locations,
8088                 .migration      = 1,
8089                 .renew          = 1,
8090         };
8091         struct rpc_message msg = {
8092                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8093                 .rpc_argp       = &args,
8094                 .rpc_resp       = &res,
8095                 .rpc_cred       = cred,
8096         };
8097         unsigned long now = jiffies;
8098         int status;
8099
8100         nfs_fattr_init(locations->fattr);
8101         locations->server = server;
8102         locations->nlocations = 0;
8103
8104         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8105         status = nfs4_call_sync_sequence(clnt, server, &msg,
8106                                         &args.seq_args, &res.seq_res);
8107         if (status)
8108                 return status;
8109
8110         renew_lease(server, now);
8111         return 0;
8112 }
8113
8114 #ifdef CONFIG_NFS_V4_1
8115
8116 /*
8117  * This operation also signals the server that this client is
8118  * performing migration recovery.  The server can stop asserting
8119  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8120  * performing this operation is identified in the SEQUENCE
8121  * operation in this compound.
8122  *
8123  * When the client supports GETATTR(fs_locations_info), it can
8124  * be plumbed in here.
8125  */
8126 static int _nfs41_proc_get_locations(struct nfs_server *server,
8127                                      struct nfs_fh *fhandle,
8128                                      struct nfs4_fs_locations *locations,
8129                                      struct page *page, const struct cred *cred)
8130 {
8131         struct rpc_clnt *clnt = server->client;
8132         u32 bitmask[2] = {
8133                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8134         };
8135         struct nfs4_fs_locations_arg args = {
8136                 .fh             = fhandle,
8137                 .page           = page,
8138                 .bitmask        = bitmask,
8139                 .migration      = 1,            /* skip LOOKUP */
8140         };
8141         struct nfs4_fs_locations_res res = {
8142                 .fs_locations   = locations,
8143                 .migration      = 1,
8144         };
8145         struct rpc_message msg = {
8146                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8147                 .rpc_argp       = &args,
8148                 .rpc_resp       = &res,
8149                 .rpc_cred       = cred,
8150         };
8151         struct nfs4_call_sync_data data = {
8152                 .seq_server = server,
8153                 .seq_args = &args.seq_args,
8154                 .seq_res = &res.seq_res,
8155         };
8156         struct rpc_task_setup task_setup_data = {
8157                 .rpc_client = clnt,
8158                 .rpc_message = &msg,
8159                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8160                 .callback_data = &data,
8161                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8162         };
8163         int status;
8164
8165         nfs_fattr_init(locations->fattr);
8166         locations->server = server;
8167         locations->nlocations = 0;
8168
8169         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8170         status = nfs4_call_sync_custom(&task_setup_data);
8171         if (status == NFS4_OK &&
8172             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8173                 status = -NFS4ERR_LEASE_MOVED;
8174         return status;
8175 }
8176
8177 #endif  /* CONFIG_NFS_V4_1 */
8178
8179 /**
8180  * nfs4_proc_get_locations - discover locations for a migrated FSID
8181  * @server: pointer to nfs_server to process
8182  * @fhandle: pointer to the kernel NFS client file handle
8183  * @locations: result of query
8184  * @page: buffer
8185  * @cred: credential to use for this operation
8186  *
8187  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8188  * operation failed, or a negative errno if a local error occurred.
8189  *
8190  * On success, "locations" is filled in, but if the server has
8191  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8192  * asserted.
8193  *
8194  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8195  * from this client that require migration recovery.
8196  */
8197 int nfs4_proc_get_locations(struct nfs_server *server,
8198                             struct nfs_fh *fhandle,
8199                             struct nfs4_fs_locations *locations,
8200                             struct page *page, const struct cred *cred)
8201 {
8202         struct nfs_client *clp = server->nfs_client;
8203         const struct nfs4_mig_recovery_ops *ops =
8204                                         clp->cl_mvops->mig_recovery_ops;
8205         struct nfs4_exception exception = {
8206                 .interruptible = true,
8207         };
8208         int status;
8209
8210         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8211                 (unsigned long long)server->fsid.major,
8212                 (unsigned long long)server->fsid.minor,
8213                 clp->cl_hostname);
8214         nfs_display_fhandle(fhandle, __func__);
8215
8216         do {
8217                 status = ops->get_locations(server, fhandle, locations, page,
8218                                             cred);
8219                 if (status != -NFS4ERR_DELAY)
8220                         break;
8221                 nfs4_handle_exception(server, status, &exception);
8222         } while (exception.retry);
8223         return status;
8224 }
8225
8226 /*
8227  * This operation also signals the server that this client is
8228  * performing "lease moved" recovery.  The server can stop
8229  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8230  * is appended to this compound to identify the client ID which is
8231  * performing recovery.
8232  */
8233 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8234 {
8235         struct nfs_server *server = NFS_SERVER(inode);
8236         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8237         struct rpc_clnt *clnt = server->client;
8238         struct nfs4_fsid_present_arg args = {
8239                 .fh             = NFS_FH(inode),
8240                 .clientid       = clp->cl_clientid,
8241                 .renew          = 1,            /* append RENEW */
8242         };
8243         struct nfs4_fsid_present_res res = {
8244                 .renew          = 1,
8245         };
8246         struct rpc_message msg = {
8247                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8248                 .rpc_argp       = &args,
8249                 .rpc_resp       = &res,
8250                 .rpc_cred       = cred,
8251         };
8252         unsigned long now = jiffies;
8253         int status;
8254
8255         res.fh = nfs_alloc_fhandle();
8256         if (res.fh == NULL)
8257                 return -ENOMEM;
8258
8259         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8260         status = nfs4_call_sync_sequence(clnt, server, &msg,
8261                                                 &args.seq_args, &res.seq_res);
8262         nfs_free_fhandle(res.fh);
8263         if (status)
8264                 return status;
8265
8266         do_renew_lease(clp, now);
8267         return 0;
8268 }
8269
8270 #ifdef CONFIG_NFS_V4_1
8271
8272 /*
8273  * This operation also signals the server that this client is
8274  * performing "lease moved" recovery.  The server can stop asserting
8275  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8276  * this operation is identified in the SEQUENCE operation in this
8277  * compound.
8278  */
8279 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8280 {
8281         struct nfs_server *server = NFS_SERVER(inode);
8282         struct rpc_clnt *clnt = server->client;
8283         struct nfs4_fsid_present_arg args = {
8284                 .fh             = NFS_FH(inode),
8285         };
8286         struct nfs4_fsid_present_res res = {
8287         };
8288         struct rpc_message msg = {
8289                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8290                 .rpc_argp       = &args,
8291                 .rpc_resp       = &res,
8292                 .rpc_cred       = cred,
8293         };
8294         int status;
8295
8296         res.fh = nfs_alloc_fhandle();
8297         if (res.fh == NULL)
8298                 return -ENOMEM;
8299
8300         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8301         status = nfs4_call_sync_sequence(clnt, server, &msg,
8302                                                 &args.seq_args, &res.seq_res);
8303         nfs_free_fhandle(res.fh);
8304         if (status == NFS4_OK &&
8305             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8306                 status = -NFS4ERR_LEASE_MOVED;
8307         return status;
8308 }
8309
8310 #endif  /* CONFIG_NFS_V4_1 */
8311
8312 /**
8313  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8314  * @inode: inode on FSID to check
8315  * @cred: credential to use for this operation
8316  *
8317  * Server indicates whether the FSID is present, moved, or not
8318  * recognized.  This operation is necessary to clear a LEASE_MOVED
8319  * condition for this client ID.
8320  *
8321  * Returns NFS4_OK if the FSID is present on this server,
8322  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8323  *  NFS4ERR code if some error occurred on the server, or a
8324  *  negative errno if a local failure occurred.
8325  */
8326 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8327 {
8328         struct nfs_server *server = NFS_SERVER(inode);
8329         struct nfs_client *clp = server->nfs_client;
8330         const struct nfs4_mig_recovery_ops *ops =
8331                                         clp->cl_mvops->mig_recovery_ops;
8332         struct nfs4_exception exception = {
8333                 .interruptible = true,
8334         };
8335         int status;
8336
8337         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8338                 (unsigned long long)server->fsid.major,
8339                 (unsigned long long)server->fsid.minor,
8340                 clp->cl_hostname);
8341         nfs_display_fhandle(NFS_FH(inode), __func__);
8342
8343         do {
8344                 status = ops->fsid_present(inode, cred);
8345                 if (status != -NFS4ERR_DELAY)
8346                         break;
8347                 nfs4_handle_exception(server, status, &exception);
8348         } while (exception.retry);
8349         return status;
8350 }
8351
8352 /*
8353  * If 'use_integrity' is true and the state managment nfs_client
8354  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8355  * and the machine credential as per RFC3530bis and RFC5661 Security
8356  * Considerations sections. Otherwise, just use the user cred with the
8357  * filesystem's rpc_client.
8358  */
8359 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8360 {
8361         int status;
8362         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8363         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8364         struct nfs4_secinfo_arg args = {
8365                 .dir_fh = NFS_FH(dir),
8366                 .name   = name,
8367         };
8368         struct nfs4_secinfo_res res = {
8369                 .flavors     = flavors,
8370         };
8371         struct rpc_message msg = {
8372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8373                 .rpc_argp = &args,
8374                 .rpc_resp = &res,
8375         };
8376         struct nfs4_call_sync_data data = {
8377                 .seq_server = NFS_SERVER(dir),
8378                 .seq_args = &args.seq_args,
8379                 .seq_res = &res.seq_res,
8380         };
8381         struct rpc_task_setup task_setup = {
8382                 .rpc_client = clnt,
8383                 .rpc_message = &msg,
8384                 .callback_ops = clp->cl_mvops->call_sync_ops,
8385                 .callback_data = &data,
8386                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8387         };
8388         const struct cred *cred = NULL;
8389
8390         if (use_integrity) {
8391                 clnt = clp->cl_rpcclient;
8392                 task_setup.rpc_client = clnt;
8393
8394                 cred = nfs4_get_clid_cred(clp);
8395                 msg.rpc_cred = cred;
8396         }
8397
8398         dprintk("NFS call  secinfo %s\n", name->name);
8399
8400         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8401         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8402         status = nfs4_call_sync_custom(&task_setup);
8403
8404         dprintk("NFS reply  secinfo: %d\n", status);
8405
8406         put_cred(cred);
8407         return status;
8408 }
8409
8410 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8411                       struct nfs4_secinfo_flavors *flavors)
8412 {
8413         struct nfs4_exception exception = {
8414                 .interruptible = true,
8415         };
8416         int err;
8417         do {
8418                 err = -NFS4ERR_WRONGSEC;
8419
8420                 /* try to use integrity protection with machine cred */
8421                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8422                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8423
8424                 /*
8425                  * if unable to use integrity protection, or SECINFO with
8426                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8427                  * disallowed by spec, but exists in deployed servers) use
8428                  * the current filesystem's rpc_client and the user cred.
8429                  */
8430                 if (err == -NFS4ERR_WRONGSEC)
8431                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8432
8433                 trace_nfs4_secinfo(dir, name, err);
8434                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8435                                 &exception);
8436         } while (exception.retry);
8437         return err;
8438 }
8439
8440 #ifdef CONFIG_NFS_V4_1
8441 /*
8442  * Check the exchange flags returned by the server for invalid flags, having
8443  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8444  * DS flags set.
8445  */
8446 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8447 {
8448         if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8449                 goto out_inval;
8450         else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8451                 goto out_inval;
8452         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8453             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8454                 goto out_inval;
8455         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8456                 goto out_inval;
8457         return NFS_OK;
8458 out_inval:
8459         return -NFS4ERR_INVAL;
8460 }
8461
8462 static bool
8463 nfs41_same_server_scope(struct nfs41_server_scope *a,
8464                         struct nfs41_server_scope *b)
8465 {
8466         if (a->server_scope_sz != b->server_scope_sz)
8467                 return false;
8468         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8469 }
8470
8471 static void
8472 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8473 {
8474         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8475         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8476         struct nfs_client *clp = args->client;
8477
8478         switch (task->tk_status) {
8479         case -NFS4ERR_BADSESSION:
8480         case -NFS4ERR_DEADSESSION:
8481                 nfs4_schedule_session_recovery(clp->cl_session,
8482                                 task->tk_status);
8483                 return;
8484         }
8485         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8486                         res->dir != NFS4_CDFS4_BOTH) {
8487                 rpc_task_close_connection(task);
8488                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8489                         rpc_restart_call(task);
8490         }
8491 }
8492
8493 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8494         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8495 };
8496
8497 /*
8498  * nfs4_proc_bind_one_conn_to_session()
8499  *
8500  * The 4.1 client currently uses the same TCP connection for the
8501  * fore and backchannel.
8502  */
8503 static
8504 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8505                 struct rpc_xprt *xprt,
8506                 struct nfs_client *clp,
8507                 const struct cred *cred)
8508 {
8509         int status;
8510         struct nfs41_bind_conn_to_session_args args = {
8511                 .client = clp,
8512                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8513                 .retries = 0,
8514         };
8515         struct nfs41_bind_conn_to_session_res res;
8516         struct rpc_message msg = {
8517                 .rpc_proc =
8518                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8519                 .rpc_argp = &args,
8520                 .rpc_resp = &res,
8521                 .rpc_cred = cred,
8522         };
8523         struct rpc_task_setup task_setup_data = {
8524                 .rpc_client = clnt,
8525                 .rpc_xprt = xprt,
8526                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8527                 .rpc_message = &msg,
8528                 .flags = RPC_TASK_TIMEOUT,
8529         };
8530         struct rpc_task *task;
8531
8532         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8533         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8534                 args.dir = NFS4_CDFC4_FORE;
8535
8536         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8537         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8538                 args.dir = NFS4_CDFC4_FORE;
8539
8540         task = rpc_run_task(&task_setup_data);
8541         if (!IS_ERR(task)) {
8542                 status = task->tk_status;
8543                 rpc_put_task(task);
8544         } else
8545                 status = PTR_ERR(task);
8546         trace_nfs4_bind_conn_to_session(clp, status);
8547         if (status == 0) {
8548                 if (memcmp(res.sessionid.data,
8549                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8550                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8551                         return -EIO;
8552                 }
8553                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8554                         dprintk("NFS: %s: Unexpected direction from server\n",
8555                                 __func__);
8556                         return -EIO;
8557                 }
8558                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8559                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8560                                 __func__);
8561                         return -EIO;
8562                 }
8563         }
8564
8565         return status;
8566 }
8567
8568 struct rpc_bind_conn_calldata {
8569         struct nfs_client *clp;
8570         const struct cred *cred;
8571 };
8572
8573 static int
8574 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8575                 struct rpc_xprt *xprt,
8576                 void *calldata)
8577 {
8578         struct rpc_bind_conn_calldata *p = calldata;
8579
8580         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8581 }
8582
8583 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8584 {
8585         struct rpc_bind_conn_calldata data = {
8586                 .clp = clp,
8587                 .cred = cred,
8588         };
8589         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8590                         nfs4_proc_bind_conn_to_session_callback, &data);
8591 }
8592
8593 /*
8594  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8595  * and operations we'd like to see to enable certain features in the allow map
8596  */
8597 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8598         .how = SP4_MACH_CRED,
8599         .enforce.u.words = {
8600                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8601                       1 << (OP_EXCHANGE_ID - 32) |
8602                       1 << (OP_CREATE_SESSION - 32) |
8603                       1 << (OP_DESTROY_SESSION - 32) |
8604                       1 << (OP_DESTROY_CLIENTID - 32)
8605         },
8606         .allow.u.words = {
8607                 [0] = 1 << (OP_CLOSE) |
8608                       1 << (OP_OPEN_DOWNGRADE) |
8609                       1 << (OP_LOCKU) |
8610                       1 << (OP_DELEGRETURN) |
8611                       1 << (OP_COMMIT),
8612                 [1] = 1 << (OP_SECINFO - 32) |
8613                       1 << (OP_SECINFO_NO_NAME - 32) |
8614                       1 << (OP_LAYOUTRETURN - 32) |
8615                       1 << (OP_TEST_STATEID - 32) |
8616                       1 << (OP_FREE_STATEID - 32) |
8617                       1 << (OP_WRITE - 32)
8618         }
8619 };
8620
8621 /*
8622  * Select the state protection mode for client `clp' given the server results
8623  * from exchange_id in `sp'.
8624  *
8625  * Returns 0 on success, negative errno otherwise.
8626  */
8627 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8628                                  struct nfs41_state_protection *sp)
8629 {
8630         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8631                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8632                       1 << (OP_EXCHANGE_ID - 32) |
8633                       1 << (OP_CREATE_SESSION - 32) |
8634                       1 << (OP_DESTROY_SESSION - 32) |
8635                       1 << (OP_DESTROY_CLIENTID - 32)
8636         };
8637         unsigned long flags = 0;
8638         unsigned int i;
8639         int ret = 0;
8640
8641         if (sp->how == SP4_MACH_CRED) {
8642                 /* Print state protect result */
8643                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8644                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8645                         if (test_bit(i, sp->enforce.u.longs))
8646                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8647                         if (test_bit(i, sp->allow.u.longs))
8648                                 dfprintk(MOUNT, "  allow op %d\n", i);
8649                 }
8650
8651                 /* make sure nothing is on enforce list that isn't supported */
8652                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8653                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8654                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8655                                 ret = -EINVAL;
8656                                 goto out;
8657                         }
8658                 }
8659
8660                 /*
8661                  * Minimal mode - state operations are allowed to use machine
8662                  * credential.  Note this already happens by default, so the
8663                  * client doesn't have to do anything more than the negotiation.
8664                  *
8665                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8666                  *       we're already using the machine cred for exchange_id
8667                  *       and will never use a different cred.
8668                  */
8669                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8670                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8671                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8672                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8673                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8674                         dfprintk(MOUNT, "  minimal mode enabled\n");
8675                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8676                 } else {
8677                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8678                         ret = -EINVAL;
8679                         goto out;
8680                 }
8681
8682                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8683                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8684                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8685                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8686                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8687                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8688                 }
8689
8690                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8691                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8692                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8693                 }
8694
8695                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8696                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8697                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8698                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8699                 }
8700
8701                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8702                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8703                         dfprintk(MOUNT, "  stateid mode enabled\n");
8704                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8705                 }
8706
8707                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8708                         dfprintk(MOUNT, "  write mode enabled\n");
8709                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8710                 }
8711
8712                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8713                         dfprintk(MOUNT, "  commit mode enabled\n");
8714                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8715                 }
8716         }
8717 out:
8718         clp->cl_sp4_flags = flags;
8719         return ret;
8720 }
8721
8722 struct nfs41_exchange_id_data {
8723         struct nfs41_exchange_id_res res;
8724         struct nfs41_exchange_id_args args;
8725 };
8726
8727 static void nfs4_exchange_id_release(void *data)
8728 {
8729         struct nfs41_exchange_id_data *cdata =
8730                                         (struct nfs41_exchange_id_data *)data;
8731
8732         nfs_put_client(cdata->args.client);
8733         kfree(cdata->res.impl_id);
8734         kfree(cdata->res.server_scope);
8735         kfree(cdata->res.server_owner);
8736         kfree(cdata);
8737 }
8738
8739 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8740         .rpc_release = nfs4_exchange_id_release,
8741 };
8742
8743 /*
8744  * _nfs4_proc_exchange_id()
8745  *
8746  * Wrapper for EXCHANGE_ID operation.
8747  */
8748 static struct rpc_task *
8749 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8750                         u32 sp4_how, struct rpc_xprt *xprt)
8751 {
8752         struct rpc_message msg = {
8753                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8754                 .rpc_cred = cred,
8755         };
8756         struct rpc_task_setup task_setup_data = {
8757                 .rpc_client = clp->cl_rpcclient,
8758                 .callback_ops = &nfs4_exchange_id_call_ops,
8759                 .rpc_message = &msg,
8760                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8761         };
8762         struct nfs41_exchange_id_data *calldata;
8763         int status;
8764
8765         if (!refcount_inc_not_zero(&clp->cl_count))
8766                 return ERR_PTR(-EIO);
8767
8768         status = -ENOMEM;
8769         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8770         if (!calldata)
8771                 goto out;
8772
8773         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8774
8775         status = nfs4_init_uniform_client_string(clp);
8776         if (status)
8777                 goto out_calldata;
8778
8779         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8780                                                 GFP_NOFS);
8781         status = -ENOMEM;
8782         if (unlikely(calldata->res.server_owner == NULL))
8783                 goto out_calldata;
8784
8785         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8786                                         GFP_NOFS);
8787         if (unlikely(calldata->res.server_scope == NULL))
8788                 goto out_server_owner;
8789
8790         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8791         if (unlikely(calldata->res.impl_id == NULL))
8792                 goto out_server_scope;
8793
8794         switch (sp4_how) {
8795         case SP4_NONE:
8796                 calldata->args.state_protect.how = SP4_NONE;
8797                 break;
8798
8799         case SP4_MACH_CRED:
8800                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8801                 break;
8802
8803         default:
8804                 /* unsupported! */
8805                 WARN_ON_ONCE(1);
8806                 status = -EINVAL;
8807                 goto out_impl_id;
8808         }
8809         if (xprt) {
8810                 task_setup_data.rpc_xprt = xprt;
8811                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8812                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8813                                 sizeof(calldata->args.verifier.data));
8814         }
8815         calldata->args.client = clp;
8816         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8817         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8818 #ifdef CONFIG_NFS_V4_1_MIGRATION
8819         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8820 #endif
8821         if (test_bit(NFS_CS_DS, &clp->cl_flags))
8822                 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8823         msg.rpc_argp = &calldata->args;
8824         msg.rpc_resp = &calldata->res;
8825         task_setup_data.callback_data = calldata;
8826
8827         return rpc_run_task(&task_setup_data);
8828
8829 out_impl_id:
8830         kfree(calldata->res.impl_id);
8831 out_server_scope:
8832         kfree(calldata->res.server_scope);
8833 out_server_owner:
8834         kfree(calldata->res.server_owner);
8835 out_calldata:
8836         kfree(calldata);
8837 out:
8838         nfs_put_client(clp);
8839         return ERR_PTR(status);
8840 }
8841
8842 /*
8843  * _nfs4_proc_exchange_id()
8844  *
8845  * Wrapper for EXCHANGE_ID operation.
8846  */
8847 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8848                         u32 sp4_how)
8849 {
8850         struct rpc_task *task;
8851         struct nfs41_exchange_id_args *argp;
8852         struct nfs41_exchange_id_res *resp;
8853         unsigned long now = jiffies;
8854         int status;
8855
8856         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8857         if (IS_ERR(task))
8858                 return PTR_ERR(task);
8859
8860         argp = task->tk_msg.rpc_argp;
8861         resp = task->tk_msg.rpc_resp;
8862         status = task->tk_status;
8863         if (status  != 0)
8864                 goto out;
8865
8866         status = nfs4_check_cl_exchange_flags(resp->flags,
8867                         clp->cl_mvops->minor_version);
8868         if (status  != 0)
8869                 goto out;
8870
8871         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8872         if (status != 0)
8873                 goto out;
8874
8875         do_renew_lease(clp, now);
8876
8877         clp->cl_clientid = resp->clientid;
8878         clp->cl_exchange_flags = resp->flags;
8879         clp->cl_seqid = resp->seqid;
8880         /* Client ID is not confirmed */
8881         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8882                 clear_bit(NFS4_SESSION_ESTABLISHED,
8883                           &clp->cl_session->session_state);
8884
8885         if (clp->cl_serverscope != NULL &&
8886             !nfs41_same_server_scope(clp->cl_serverscope,
8887                                 resp->server_scope)) {
8888                 dprintk("%s: server_scope mismatch detected\n",
8889                         __func__);
8890                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8891         }
8892
8893         swap(clp->cl_serverowner, resp->server_owner);
8894         swap(clp->cl_serverscope, resp->server_scope);
8895         swap(clp->cl_implid, resp->impl_id);
8896
8897         /* Save the EXCHANGE_ID verifier session trunk tests */
8898         memcpy(clp->cl_confirm.data, argp->verifier.data,
8899                sizeof(clp->cl_confirm.data));
8900 out:
8901         trace_nfs4_exchange_id(clp, status);
8902         rpc_put_task(task);
8903         return status;
8904 }
8905
8906 /*
8907  * nfs4_proc_exchange_id()
8908  *
8909  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8910  *
8911  * Since the clientid has expired, all compounds using sessions
8912  * associated with the stale clientid will be returning
8913  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8914  * be in some phase of session reset.
8915  *
8916  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8917  */
8918 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8919 {
8920         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8921         int status;
8922
8923         /* try SP4_MACH_CRED if krb5i/p */
8924         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8925             authflavor == RPC_AUTH_GSS_KRB5P) {
8926                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8927                 if (!status)
8928                         return 0;
8929         }
8930
8931         /* try SP4_NONE */
8932         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8933 }
8934
8935 /**
8936  * nfs4_test_session_trunk
8937  *
8938  * This is an add_xprt_test() test function called from
8939  * rpc_clnt_setup_test_and_add_xprt.
8940  *
8941  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8942  * and is dereferrenced in nfs4_exchange_id_release
8943  *
8944  * Upon success, add the new transport to the rpc_clnt
8945  *
8946  * @clnt: struct rpc_clnt to get new transport
8947  * @xprt: the rpc_xprt to test
8948  * @data: call data for _nfs4_proc_exchange_id.
8949  */
8950 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8951                             void *data)
8952 {
8953         struct nfs4_add_xprt_data *adata = data;
8954         struct rpc_task *task;
8955         int status;
8956
8957         u32 sp4_how;
8958
8959         dprintk("--> %s try %s\n", __func__,
8960                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8961
8962         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8963
8964 try_again:
8965         /* Test connection for session trunking. Async exchange_id call */
8966         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8967         if (IS_ERR(task))
8968                 return;
8969
8970         status = task->tk_status;
8971         if (status == 0) {
8972                 status = nfs4_detect_session_trunking(adata->clp,
8973                                 task->tk_msg.rpc_resp, xprt);
8974                 trace_nfs4_trunked_exchange_id(adata->clp,
8975                         xprt->address_strings[RPC_DISPLAY_ADDR], status);
8976         }
8977         if (status == 0)
8978                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8979         else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
8980                                 (struct sockaddr *)&xprt->addr))
8981                 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8982
8983         rpc_put_task(task);
8984         if (status == -NFS4ERR_DELAY) {
8985                 ssleep(1);
8986                 goto try_again;
8987         }
8988 }
8989 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8990
8991 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8992                 const struct cred *cred)
8993 {
8994         struct rpc_message msg = {
8995                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8996                 .rpc_argp = clp,
8997                 .rpc_cred = cred,
8998         };
8999         int status;
9000
9001         status = rpc_call_sync(clp->cl_rpcclient, &msg,
9002                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9003         trace_nfs4_destroy_clientid(clp, status);
9004         if (status)
9005                 dprintk("NFS: Got error %d from the server %s on "
9006                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
9007         return status;
9008 }
9009
9010 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
9011                 const struct cred *cred)
9012 {
9013         unsigned int loop;
9014         int ret;
9015
9016         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
9017                 ret = _nfs4_proc_destroy_clientid(clp, cred);
9018                 switch (ret) {
9019                 case -NFS4ERR_DELAY:
9020                 case -NFS4ERR_CLIENTID_BUSY:
9021                         ssleep(1);
9022                         break;
9023                 default:
9024                         return ret;
9025                 }
9026         }
9027         return 0;
9028 }
9029
9030 int nfs4_destroy_clientid(struct nfs_client *clp)
9031 {
9032         const struct cred *cred;
9033         int ret = 0;
9034
9035         if (clp->cl_mvops->minor_version < 1)
9036                 goto out;
9037         if (clp->cl_exchange_flags == 0)
9038                 goto out;
9039         if (clp->cl_preserve_clid)
9040                 goto out;
9041         cred = nfs4_get_clid_cred(clp);
9042         ret = nfs4_proc_destroy_clientid(clp, cred);
9043         put_cred(cred);
9044         switch (ret) {
9045         case 0:
9046         case -NFS4ERR_STALE_CLIENTID:
9047                 clp->cl_exchange_flags = 0;
9048         }
9049 out:
9050         return ret;
9051 }
9052
9053 #endif /* CONFIG_NFS_V4_1 */
9054
9055 struct nfs4_get_lease_time_data {
9056         struct nfs4_get_lease_time_args *args;
9057         struct nfs4_get_lease_time_res *res;
9058         struct nfs_client *clp;
9059 };
9060
9061 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9062                                         void *calldata)
9063 {
9064         struct nfs4_get_lease_time_data *data =
9065                         (struct nfs4_get_lease_time_data *)calldata;
9066
9067         /* just setup sequence, do not trigger session recovery
9068            since we're invoked within one */
9069         nfs4_setup_sequence(data->clp,
9070                         &data->args->la_seq_args,
9071                         &data->res->lr_seq_res,
9072                         task);
9073 }
9074
9075 /*
9076  * Called from nfs4_state_manager thread for session setup, so don't recover
9077  * from sequence operation or clientid errors.
9078  */
9079 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9080 {
9081         struct nfs4_get_lease_time_data *data =
9082                         (struct nfs4_get_lease_time_data *)calldata;
9083
9084         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9085                 return;
9086         switch (task->tk_status) {
9087         case -NFS4ERR_DELAY:
9088         case -NFS4ERR_GRACE:
9089                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9090                 task->tk_status = 0;
9091                 fallthrough;
9092         case -NFS4ERR_RETRY_UNCACHED_REP:
9093                 rpc_restart_call_prepare(task);
9094                 return;
9095         }
9096 }
9097
9098 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9099         .rpc_call_prepare = nfs4_get_lease_time_prepare,
9100         .rpc_call_done = nfs4_get_lease_time_done,
9101 };
9102
9103 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9104 {
9105         struct nfs4_get_lease_time_args args;
9106         struct nfs4_get_lease_time_res res = {
9107                 .lr_fsinfo = fsinfo,
9108         };
9109         struct nfs4_get_lease_time_data data = {
9110                 .args = &args,
9111                 .res = &res,
9112                 .clp = clp,
9113         };
9114         struct rpc_message msg = {
9115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9116                 .rpc_argp = &args,
9117                 .rpc_resp = &res,
9118         };
9119         struct rpc_task_setup task_setup = {
9120                 .rpc_client = clp->cl_rpcclient,
9121                 .rpc_message = &msg,
9122                 .callback_ops = &nfs4_get_lease_time_ops,
9123                 .callback_data = &data,
9124                 .flags = RPC_TASK_TIMEOUT,
9125         };
9126
9127         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9128         return nfs4_call_sync_custom(&task_setup);
9129 }
9130
9131 #ifdef CONFIG_NFS_V4_1
9132
9133 /*
9134  * Initialize the values to be used by the client in CREATE_SESSION
9135  * If nfs4_init_session set the fore channel request and response sizes,
9136  * use them.
9137  *
9138  * Set the back channel max_resp_sz_cached to zero to force the client to
9139  * always set csa_cachethis to FALSE because the current implementation
9140  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9141  */
9142 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9143                                     struct rpc_clnt *clnt)
9144 {
9145         unsigned int max_rqst_sz, max_resp_sz;
9146         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9147         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9148
9149         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9150         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9151
9152         /* Fore channel attributes */
9153         args->fc_attrs.max_rqst_sz = max_rqst_sz;
9154         args->fc_attrs.max_resp_sz = max_resp_sz;
9155         args->fc_attrs.max_ops = NFS4_MAX_OPS;
9156         args->fc_attrs.max_reqs = max_session_slots;
9157
9158         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9159                 "max_ops=%u max_reqs=%u\n",
9160                 __func__,
9161                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9162                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9163
9164         /* Back channel attributes */
9165         args->bc_attrs.max_rqst_sz = max_bc_payload;
9166         args->bc_attrs.max_resp_sz = max_bc_payload;
9167         args->bc_attrs.max_resp_sz_cached = 0;
9168         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9169         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9170         if (args->bc_attrs.max_reqs > max_bc_slots)
9171                 args->bc_attrs.max_reqs = max_bc_slots;
9172
9173         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9174                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9175                 __func__,
9176                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9177                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9178                 args->bc_attrs.max_reqs);
9179 }
9180
9181 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9182                 struct nfs41_create_session_res *res)
9183 {
9184         struct nfs4_channel_attrs *sent = &args->fc_attrs;
9185         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9186
9187         if (rcvd->max_resp_sz > sent->max_resp_sz)
9188                 return -EINVAL;
9189         /*
9190          * Our requested max_ops is the minimum we need; we're not
9191          * prepared to break up compounds into smaller pieces than that.
9192          * So, no point even trying to continue if the server won't
9193          * cooperate:
9194          */
9195         if (rcvd->max_ops < sent->max_ops)
9196                 return -EINVAL;
9197         if (rcvd->max_reqs == 0)
9198                 return -EINVAL;
9199         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9200                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9201         return 0;
9202 }
9203
9204 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9205                 struct nfs41_create_session_res *res)
9206 {
9207         struct nfs4_channel_attrs *sent = &args->bc_attrs;
9208         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9209
9210         if (!(res->flags & SESSION4_BACK_CHAN))
9211                 goto out;
9212         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9213                 return -EINVAL;
9214         if (rcvd->max_resp_sz < sent->max_resp_sz)
9215                 return -EINVAL;
9216         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9217                 return -EINVAL;
9218         if (rcvd->max_ops > sent->max_ops)
9219                 return -EINVAL;
9220         if (rcvd->max_reqs > sent->max_reqs)
9221                 return -EINVAL;
9222 out:
9223         return 0;
9224 }
9225
9226 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9227                                      struct nfs41_create_session_res *res)
9228 {
9229         int ret;
9230
9231         ret = nfs4_verify_fore_channel_attrs(args, res);
9232         if (ret)
9233                 return ret;
9234         return nfs4_verify_back_channel_attrs(args, res);
9235 }
9236
9237 static void nfs4_update_session(struct nfs4_session *session,
9238                 struct nfs41_create_session_res *res)
9239 {
9240         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9241         /* Mark client id and session as being confirmed */
9242         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9243         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9244         session->flags = res->flags;
9245         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9246         if (res->flags & SESSION4_BACK_CHAN)
9247                 memcpy(&session->bc_attrs, &res->bc_attrs,
9248                                 sizeof(session->bc_attrs));
9249 }
9250
9251 static int _nfs4_proc_create_session(struct nfs_client *clp,
9252                 const struct cred *cred)
9253 {
9254         struct nfs4_session *session = clp->cl_session;
9255         struct nfs41_create_session_args args = {
9256                 .client = clp,
9257                 .clientid = clp->cl_clientid,
9258                 .seqid = clp->cl_seqid,
9259                 .cb_program = NFS4_CALLBACK,
9260         };
9261         struct nfs41_create_session_res res;
9262
9263         struct rpc_message msg = {
9264                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9265                 .rpc_argp = &args,
9266                 .rpc_resp = &res,
9267                 .rpc_cred = cred,
9268         };
9269         int status;
9270
9271         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9272         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9273
9274         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9275                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9276         trace_nfs4_create_session(clp, status);
9277
9278         switch (status) {
9279         case -NFS4ERR_STALE_CLIENTID:
9280         case -NFS4ERR_DELAY:
9281         case -ETIMEDOUT:
9282         case -EACCES:
9283         case -EAGAIN:
9284                 goto out;
9285         }
9286
9287         clp->cl_seqid++;
9288         if (!status) {
9289                 /* Verify the session's negotiated channel_attrs values */
9290                 status = nfs4_verify_channel_attrs(&args, &res);
9291                 /* Increment the clientid slot sequence id */
9292                 if (status)
9293                         goto out;
9294                 nfs4_update_session(session, &res);
9295         }
9296 out:
9297         return status;
9298 }
9299
9300 /*
9301  * Issues a CREATE_SESSION operation to the server.
9302  * It is the responsibility of the caller to verify the session is
9303  * expired before calling this routine.
9304  */
9305 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9306 {
9307         int status;
9308         unsigned *ptr;
9309         struct nfs4_session *session = clp->cl_session;
9310         struct nfs4_add_xprt_data xprtdata = {
9311                 .clp = clp,
9312         };
9313         struct rpc_add_xprt_test rpcdata = {
9314                 .add_xprt_test = clp->cl_mvops->session_trunk,
9315                 .data = &xprtdata,
9316         };
9317
9318         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9319
9320         status = _nfs4_proc_create_session(clp, cred);
9321         if (status)
9322                 goto out;
9323
9324         /* Init or reset the session slot tables */
9325         status = nfs4_setup_session_slot_tables(session);
9326         dprintk("slot table setup returned %d\n", status);
9327         if (status)
9328                 goto out;
9329
9330         ptr = (unsigned *)&session->sess_id.data[0];
9331         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9332                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9333         rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9334 out:
9335         return status;
9336 }
9337
9338 /*
9339  * Issue the over-the-wire RPC DESTROY_SESSION.
9340  * The caller must serialize access to this routine.
9341  */
9342 int nfs4_proc_destroy_session(struct nfs4_session *session,
9343                 const struct cred *cred)
9344 {
9345         struct rpc_message msg = {
9346                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9347                 .rpc_argp = session,
9348                 .rpc_cred = cred,
9349         };
9350         int status = 0;
9351
9352         /* session is still being setup */
9353         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9354                 return 0;
9355
9356         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9357                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9358         trace_nfs4_destroy_session(session->clp, status);
9359
9360         if (status)
9361                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9362                         "Session has been destroyed regardless...\n", status);
9363         rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9364         return status;
9365 }
9366
9367 /*
9368  * Renew the cl_session lease.
9369  */
9370 struct nfs4_sequence_data {
9371         struct nfs_client *clp;
9372         struct nfs4_sequence_args args;
9373         struct nfs4_sequence_res res;
9374 };
9375
9376 static void nfs41_sequence_release(void *data)
9377 {
9378         struct nfs4_sequence_data *calldata = data;
9379         struct nfs_client *clp = calldata->clp;
9380
9381         if (refcount_read(&clp->cl_count) > 1)
9382                 nfs4_schedule_state_renewal(clp);
9383         nfs_put_client(clp);
9384         kfree(calldata);
9385 }
9386
9387 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9388 {
9389         switch(task->tk_status) {
9390         case -NFS4ERR_DELAY:
9391                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9392                 return -EAGAIN;
9393         default:
9394                 nfs4_schedule_lease_recovery(clp);
9395         }
9396         return 0;
9397 }
9398
9399 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9400 {
9401         struct nfs4_sequence_data *calldata = data;
9402         struct nfs_client *clp = calldata->clp;
9403
9404         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9405                 return;
9406
9407         trace_nfs4_sequence(clp, task->tk_status);
9408         if (task->tk_status < 0 && !task->tk_client->cl_shutdown) {
9409                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9410                 if (refcount_read(&clp->cl_count) == 1)
9411                         return;
9412
9413                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9414                         rpc_restart_call_prepare(task);
9415                         return;
9416                 }
9417         }
9418         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9419 }
9420
9421 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9422 {
9423         struct nfs4_sequence_data *calldata = data;
9424         struct nfs_client *clp = calldata->clp;
9425         struct nfs4_sequence_args *args;
9426         struct nfs4_sequence_res *res;
9427
9428         args = task->tk_msg.rpc_argp;
9429         res = task->tk_msg.rpc_resp;
9430
9431         nfs4_setup_sequence(clp, args, res, task);
9432 }
9433
9434 static const struct rpc_call_ops nfs41_sequence_ops = {
9435         .rpc_call_done = nfs41_sequence_call_done,
9436         .rpc_call_prepare = nfs41_sequence_prepare,
9437         .rpc_release = nfs41_sequence_release,
9438 };
9439
9440 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9441                 const struct cred *cred,
9442                 struct nfs4_slot *slot,
9443                 bool is_privileged)
9444 {
9445         struct nfs4_sequence_data *calldata;
9446         struct rpc_message msg = {
9447                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9448                 .rpc_cred = cred,
9449         };
9450         struct rpc_task_setup task_setup_data = {
9451                 .rpc_client = clp->cl_rpcclient,
9452                 .rpc_message = &msg,
9453                 .callback_ops = &nfs41_sequence_ops,
9454                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9455         };
9456         struct rpc_task *ret;
9457
9458         ret = ERR_PTR(-EIO);
9459         if (!refcount_inc_not_zero(&clp->cl_count))
9460                 goto out_err;
9461
9462         ret = ERR_PTR(-ENOMEM);
9463         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9464         if (calldata == NULL)
9465                 goto out_put_clp;
9466         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9467         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9468         msg.rpc_argp = &calldata->args;
9469         msg.rpc_resp = &calldata->res;
9470         calldata->clp = clp;
9471         task_setup_data.callback_data = calldata;
9472
9473         ret = rpc_run_task(&task_setup_data);
9474         if (IS_ERR(ret))
9475                 goto out_err;
9476         return ret;
9477 out_put_clp:
9478         nfs_put_client(clp);
9479 out_err:
9480         nfs41_release_slot(slot);
9481         return ret;
9482 }
9483
9484 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9485 {
9486         struct rpc_task *task;
9487         int ret = 0;
9488
9489         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9490                 return -EAGAIN;
9491         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9492         if (IS_ERR(task))
9493                 ret = PTR_ERR(task);
9494         else
9495                 rpc_put_task_async(task);
9496         dprintk("<-- %s status=%d\n", __func__, ret);
9497         return ret;
9498 }
9499
9500 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9501 {
9502         struct rpc_task *task;
9503         int ret;
9504
9505         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9506         if (IS_ERR(task)) {
9507                 ret = PTR_ERR(task);
9508                 goto out;
9509         }
9510         ret = rpc_wait_for_completion_task(task);
9511         if (!ret)
9512                 ret = task->tk_status;
9513         rpc_put_task(task);
9514 out:
9515         dprintk("<-- %s status=%d\n", __func__, ret);
9516         return ret;
9517 }
9518
9519 struct nfs4_reclaim_complete_data {
9520         struct nfs_client *clp;
9521         struct nfs41_reclaim_complete_args arg;
9522         struct nfs41_reclaim_complete_res res;
9523 };
9524
9525 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9526 {
9527         struct nfs4_reclaim_complete_data *calldata = data;
9528
9529         nfs4_setup_sequence(calldata->clp,
9530                         &calldata->arg.seq_args,
9531                         &calldata->res.seq_res,
9532                         task);
9533 }
9534
9535 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9536 {
9537         switch(task->tk_status) {
9538         case 0:
9539                 wake_up_all(&clp->cl_lock_waitq);
9540                 fallthrough;
9541         case -NFS4ERR_COMPLETE_ALREADY:
9542         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9543                 break;
9544         case -NFS4ERR_DELAY:
9545                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9546                 fallthrough;
9547         case -NFS4ERR_RETRY_UNCACHED_REP:
9548         case -EACCES:
9549                 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9550                         __func__, task->tk_status, clp->cl_hostname);
9551                 return -EAGAIN;
9552         case -NFS4ERR_BADSESSION:
9553         case -NFS4ERR_DEADSESSION:
9554         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9555                 break;
9556         default:
9557                 nfs4_schedule_lease_recovery(clp);
9558         }
9559         return 0;
9560 }
9561
9562 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9563 {
9564         struct nfs4_reclaim_complete_data *calldata = data;
9565         struct nfs_client *clp = calldata->clp;
9566         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9567
9568         if (!nfs41_sequence_done(task, res))
9569                 return;
9570
9571         trace_nfs4_reclaim_complete(clp, task->tk_status);
9572         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9573                 rpc_restart_call_prepare(task);
9574                 return;
9575         }
9576 }
9577
9578 static void nfs4_free_reclaim_complete_data(void *data)
9579 {
9580         struct nfs4_reclaim_complete_data *calldata = data;
9581
9582         kfree(calldata);
9583 }
9584
9585 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9586         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9587         .rpc_call_done = nfs4_reclaim_complete_done,
9588         .rpc_release = nfs4_free_reclaim_complete_data,
9589 };
9590
9591 /*
9592  * Issue a global reclaim complete.
9593  */
9594 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9595                 const struct cred *cred)
9596 {
9597         struct nfs4_reclaim_complete_data *calldata;
9598         struct rpc_message msg = {
9599                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9600                 .rpc_cred = cred,
9601         };
9602         struct rpc_task_setup task_setup_data = {
9603                 .rpc_client = clp->cl_rpcclient,
9604                 .rpc_message = &msg,
9605                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9606                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9607         };
9608         int status = -ENOMEM;
9609
9610         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9611         if (calldata == NULL)
9612                 goto out;
9613         calldata->clp = clp;
9614         calldata->arg.one_fs = 0;
9615
9616         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9617         msg.rpc_argp = &calldata->arg;
9618         msg.rpc_resp = &calldata->res;
9619         task_setup_data.callback_data = calldata;
9620         status = nfs4_call_sync_custom(&task_setup_data);
9621 out:
9622         dprintk("<-- %s status=%d\n", __func__, status);
9623         return status;
9624 }
9625
9626 static void
9627 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9628 {
9629         struct nfs4_layoutget *lgp = calldata;
9630         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9631
9632         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9633                                 &lgp->res.seq_res, task);
9634 }
9635
9636 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9637 {
9638         struct nfs4_layoutget *lgp = calldata;
9639
9640         nfs41_sequence_process(task, &lgp->res.seq_res);
9641 }
9642
9643 static int
9644 nfs4_layoutget_handle_exception(struct rpc_task *task,
9645                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9646 {
9647         struct inode *inode = lgp->args.inode;
9648         struct nfs_server *server = NFS_SERVER(inode);
9649         struct pnfs_layout_hdr *lo = lgp->lo;
9650         int nfs4err = task->tk_status;
9651         int err, status = 0;
9652         LIST_HEAD(head);
9653
9654         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9655
9656         nfs4_sequence_free_slot(&lgp->res.seq_res);
9657
9658         exception->state = NULL;
9659         exception->stateid = NULL;
9660
9661         switch (nfs4err) {
9662         case 0:
9663                 goto out;
9664
9665         /*
9666          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9667          * on the file. set tk_status to -ENODATA to tell upper layer to
9668          * retry go inband.
9669          */
9670         case -NFS4ERR_LAYOUTUNAVAILABLE:
9671                 status = -ENODATA;
9672                 goto out;
9673         /*
9674          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9675          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9676          */
9677         case -NFS4ERR_BADLAYOUT:
9678                 status = -EOVERFLOW;
9679                 goto out;
9680         /*
9681          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9682          * (or clients) writing to the same RAID stripe except when
9683          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9684          *
9685          * Treat it like we would RECALLCONFLICT -- we retry for a little
9686          * while, and then eventually give up.
9687          */
9688         case -NFS4ERR_LAYOUTTRYLATER:
9689                 if (lgp->args.minlength == 0) {
9690                         status = -EOVERFLOW;
9691                         goto out;
9692                 }
9693                 status = -EBUSY;
9694                 break;
9695         case -NFS4ERR_RECALLCONFLICT:
9696         case -NFS4ERR_RETURNCONFLICT:
9697                 status = -ERECALLCONFLICT;
9698                 break;
9699         case -NFS4ERR_DELEG_REVOKED:
9700         case -NFS4ERR_ADMIN_REVOKED:
9701         case -NFS4ERR_EXPIRED:
9702         case -NFS4ERR_BAD_STATEID:
9703                 exception->timeout = 0;
9704                 spin_lock(&inode->i_lock);
9705                 /* If the open stateid was bad, then recover it. */
9706                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9707                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9708                         spin_unlock(&inode->i_lock);
9709                         exception->state = lgp->args.ctx->state;
9710                         exception->stateid = &lgp->args.stateid;
9711                         break;
9712                 }
9713
9714                 /*
9715                  * Mark the bad layout state as invalid, then retry
9716                  */
9717                 pnfs_mark_layout_stateid_invalid(lo, &head);
9718                 spin_unlock(&inode->i_lock);
9719                 nfs_commit_inode(inode, 0);
9720                 pnfs_free_lseg_list(&head);
9721                 status = -EAGAIN;
9722                 goto out;
9723         }
9724
9725         err = nfs4_handle_exception(server, nfs4err, exception);
9726         if (!status) {
9727                 if (exception->retry)
9728                         status = -EAGAIN;
9729                 else
9730                         status = err;
9731         }
9732 out:
9733         return status;
9734 }
9735
9736 size_t max_response_pages(struct nfs_server *server)
9737 {
9738         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9739         return nfs_page_array_len(0, max_resp_sz);
9740 }
9741
9742 static void nfs4_layoutget_release(void *calldata)
9743 {
9744         struct nfs4_layoutget *lgp = calldata;
9745
9746         nfs4_sequence_free_slot(&lgp->res.seq_res);
9747         pnfs_layoutget_free(lgp);
9748 }
9749
9750 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9751         .rpc_call_prepare = nfs4_layoutget_prepare,
9752         .rpc_call_done = nfs4_layoutget_done,
9753         .rpc_release = nfs4_layoutget_release,
9754 };
9755
9756 struct pnfs_layout_segment *
9757 nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
9758                     struct nfs4_exception *exception)
9759 {
9760         struct inode *inode = lgp->args.inode;
9761         struct nfs_server *server = NFS_SERVER(inode);
9762         struct rpc_task *task;
9763         struct rpc_message msg = {
9764                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9765                 .rpc_argp = &lgp->args,
9766                 .rpc_resp = &lgp->res,
9767                 .rpc_cred = lgp->cred,
9768         };
9769         struct rpc_task_setup task_setup_data = {
9770                 .rpc_client = server->client,
9771                 .rpc_message = &msg,
9772                 .callback_ops = &nfs4_layoutget_call_ops,
9773                 .callback_data = lgp,
9774                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9775                          RPC_TASK_MOVEABLE,
9776         };
9777         struct pnfs_layout_segment *lseg = NULL;
9778         int status = 0;
9779
9780         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9781         exception->retry = 0;
9782
9783         task = rpc_run_task(&task_setup_data);
9784         if (IS_ERR(task))
9785                 return ERR_CAST(task);
9786
9787         status = rpc_wait_for_completion_task(task);
9788         if (status != 0)
9789                 goto out;
9790
9791         if (task->tk_status < 0) {
9792                 exception->retry = 1;
9793                 status = nfs4_layoutget_handle_exception(task, lgp, exception);
9794         } else if (lgp->res.layoutp->len == 0) {
9795                 exception->retry = 1;
9796                 status = -EAGAIN;
9797                 nfs4_update_delay(&exception->timeout);
9798         } else
9799                 lseg = pnfs_layout_process(lgp);
9800 out:
9801         trace_nfs4_layoutget(lgp->args.ctx,
9802                         &lgp->args.range,
9803                         &lgp->res.range,
9804                         &lgp->res.stateid,
9805                         status);
9806
9807         rpc_put_task(task);
9808         dprintk("<-- %s status=%d\n", __func__, status);
9809         if (status)
9810                 return ERR_PTR(status);
9811         return lseg;
9812 }
9813
9814 static void
9815 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9816 {
9817         struct nfs4_layoutreturn *lrp = calldata;
9818
9819         nfs4_setup_sequence(lrp->clp,
9820                         &lrp->args.seq_args,
9821                         &lrp->res.seq_res,
9822                         task);
9823         if (!pnfs_layout_is_valid(lrp->args.layout))
9824                 rpc_exit(task, 0);
9825 }
9826
9827 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9828 {
9829         struct nfs4_layoutreturn *lrp = calldata;
9830         struct nfs_server *server;
9831
9832         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9833                 return;
9834
9835         /*
9836          * Was there an RPC level error? Assume the call succeeded,
9837          * and that we need to release the layout
9838          */
9839         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9840                 lrp->res.lrs_present = 0;
9841                 return;
9842         }
9843
9844         server = NFS_SERVER(lrp->args.inode);
9845         switch (task->tk_status) {
9846         case -NFS4ERR_OLD_STATEID:
9847                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9848                                         &lrp->args.range,
9849                                         lrp->args.inode))
9850                         goto out_restart;
9851                 fallthrough;
9852         default:
9853                 task->tk_status = 0;
9854                 fallthrough;
9855         case 0:
9856                 break;
9857         case -NFS4ERR_DELAY:
9858                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9859                         break;
9860                 goto out_restart;
9861         }
9862         return;
9863 out_restart:
9864         task->tk_status = 0;
9865         nfs4_sequence_free_slot(&lrp->res.seq_res);
9866         rpc_restart_call_prepare(task);
9867 }
9868
9869 static void nfs4_layoutreturn_release(void *calldata)
9870 {
9871         struct nfs4_layoutreturn *lrp = calldata;
9872         struct pnfs_layout_hdr *lo = lrp->args.layout;
9873
9874         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9875                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9876         nfs4_sequence_free_slot(&lrp->res.seq_res);
9877         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9878                 lrp->ld_private.ops->free(&lrp->ld_private);
9879         pnfs_put_layout_hdr(lrp->args.layout);
9880         nfs_iput_and_deactive(lrp->inode);
9881         put_cred(lrp->cred);
9882         kfree(calldata);
9883 }
9884
9885 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9886         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9887         .rpc_call_done = nfs4_layoutreturn_done,
9888         .rpc_release = nfs4_layoutreturn_release,
9889 };
9890
9891 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9892 {
9893         struct rpc_task *task;
9894         struct rpc_message msg = {
9895                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9896                 .rpc_argp = &lrp->args,
9897                 .rpc_resp = &lrp->res,
9898                 .rpc_cred = lrp->cred,
9899         };
9900         struct rpc_task_setup task_setup_data = {
9901                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9902                 .rpc_message = &msg,
9903                 .callback_ops = &nfs4_layoutreturn_call_ops,
9904                 .callback_data = lrp,
9905                 .flags = RPC_TASK_MOVEABLE,
9906         };
9907         int status = 0;
9908
9909         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9910                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9911                         &task_setup_data.rpc_client, &msg);
9912
9913         lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9914         if (!sync) {
9915                 if (!lrp->inode) {
9916                         nfs4_layoutreturn_release(lrp);
9917                         return -EAGAIN;
9918                 }
9919                 task_setup_data.flags |= RPC_TASK_ASYNC;
9920         }
9921         if (!lrp->inode)
9922                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9923                                    1);
9924         else
9925                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9926                                    0);
9927         task = rpc_run_task(&task_setup_data);
9928         if (IS_ERR(task))
9929                 return PTR_ERR(task);
9930         if (sync)
9931                 status = task->tk_status;
9932         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9933         dprintk("<-- %s status=%d\n", __func__, status);
9934         rpc_put_task(task);
9935         return status;
9936 }
9937
9938 static int
9939 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9940                 struct pnfs_device *pdev,
9941                 const struct cred *cred)
9942 {
9943         struct nfs4_getdeviceinfo_args args = {
9944                 .pdev = pdev,
9945                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9946                         NOTIFY_DEVICEID4_DELETE,
9947         };
9948         struct nfs4_getdeviceinfo_res res = {
9949                 .pdev = pdev,
9950         };
9951         struct rpc_message msg = {
9952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9953                 .rpc_argp = &args,
9954                 .rpc_resp = &res,
9955                 .rpc_cred = cred,
9956         };
9957         int status;
9958
9959         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9960         if (res.notification & ~args.notify_types)
9961                 dprintk("%s: unsupported notification\n", __func__);
9962         if (res.notification != args.notify_types)
9963                 pdev->nocache = 1;
9964
9965         trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9966
9967         dprintk("<-- %s status=%d\n", __func__, status);
9968
9969         return status;
9970 }
9971
9972 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9973                 struct pnfs_device *pdev,
9974                 const struct cred *cred)
9975 {
9976         struct nfs4_exception exception = { };
9977         int err;
9978
9979         do {
9980                 err = nfs4_handle_exception(server,
9981                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9982                                         &exception);
9983         } while (exception.retry);
9984         return err;
9985 }
9986 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9987
9988 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9989 {
9990         struct nfs4_layoutcommit_data *data = calldata;
9991         struct nfs_server *server = NFS_SERVER(data->args.inode);
9992
9993         nfs4_setup_sequence(server->nfs_client,
9994                         &data->args.seq_args,
9995                         &data->res.seq_res,
9996                         task);
9997 }
9998
9999 static void
10000 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
10001 {
10002         struct nfs4_layoutcommit_data *data = calldata;
10003         struct nfs_server *server = NFS_SERVER(data->args.inode);
10004
10005         if (!nfs41_sequence_done(task, &data->res.seq_res))
10006                 return;
10007
10008         switch (task->tk_status) { /* Just ignore these failures */
10009         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
10010         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
10011         case -NFS4ERR_BADLAYOUT:     /* no layout */
10012         case -NFS4ERR_GRACE:        /* loca_recalim always false */
10013                 task->tk_status = 0;
10014                 break;
10015         case 0:
10016                 break;
10017         default:
10018                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
10019                         rpc_restart_call_prepare(task);
10020                         return;
10021                 }
10022         }
10023 }
10024
10025 static void nfs4_layoutcommit_release(void *calldata)
10026 {
10027         struct nfs4_layoutcommit_data *data = calldata;
10028
10029         pnfs_cleanup_layoutcommit(data);
10030         nfs_post_op_update_inode_force_wcc(data->args.inode,
10031                                            data->res.fattr);
10032         put_cred(data->cred);
10033         nfs_iput_and_deactive(data->inode);
10034         kfree(data);
10035 }
10036
10037 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10038         .rpc_call_prepare = nfs4_layoutcommit_prepare,
10039         .rpc_call_done = nfs4_layoutcommit_done,
10040         .rpc_release = nfs4_layoutcommit_release,
10041 };
10042
10043 int
10044 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10045 {
10046         struct rpc_message msg = {
10047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10048                 .rpc_argp = &data->args,
10049                 .rpc_resp = &data->res,
10050                 .rpc_cred = data->cred,
10051         };
10052         struct rpc_task_setup task_setup_data = {
10053                 .task = &data->task,
10054                 .rpc_client = NFS_CLIENT(data->args.inode),
10055                 .rpc_message = &msg,
10056                 .callback_ops = &nfs4_layoutcommit_ops,
10057                 .callback_data = data,
10058                 .flags = RPC_TASK_MOVEABLE,
10059         };
10060         struct rpc_task *task;
10061         int status = 0;
10062
10063         dprintk("NFS: initiating layoutcommit call. sync %d "
10064                 "lbw: %llu inode %lu\n", sync,
10065                 data->args.lastbytewritten,
10066                 data->args.inode->i_ino);
10067
10068         if (!sync) {
10069                 data->inode = nfs_igrab_and_active(data->args.inode);
10070                 if (data->inode == NULL) {
10071                         nfs4_layoutcommit_release(data);
10072                         return -EAGAIN;
10073                 }
10074                 task_setup_data.flags = RPC_TASK_ASYNC;
10075         }
10076         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10077         task = rpc_run_task(&task_setup_data);
10078         if (IS_ERR(task))
10079                 return PTR_ERR(task);
10080         if (sync)
10081                 status = task->tk_status;
10082         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10083         dprintk("%s: status %d\n", __func__, status);
10084         rpc_put_task(task);
10085         return status;
10086 }
10087
10088 /*
10089  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10090  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10091  */
10092 static int
10093 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10094                     struct nfs_fsinfo *info,
10095                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10096 {
10097         struct nfs41_secinfo_no_name_args args = {
10098                 .style = SECINFO_STYLE_CURRENT_FH,
10099         };
10100         struct nfs4_secinfo_res res = {
10101                 .flavors = flavors,
10102         };
10103         struct rpc_message msg = {
10104                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10105                 .rpc_argp = &args,
10106                 .rpc_resp = &res,
10107         };
10108         struct nfs4_call_sync_data data = {
10109                 .seq_server = server,
10110                 .seq_args = &args.seq_args,
10111                 .seq_res = &res.seq_res,
10112         };
10113         struct rpc_task_setup task_setup = {
10114                 .rpc_client = server->client,
10115                 .rpc_message = &msg,
10116                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10117                 .callback_data = &data,
10118                 .flags = RPC_TASK_NO_ROUND_ROBIN,
10119         };
10120         const struct cred *cred = NULL;
10121         int status;
10122
10123         if (use_integrity) {
10124                 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10125
10126                 cred = nfs4_get_clid_cred(server->nfs_client);
10127                 msg.rpc_cred = cred;
10128         }
10129
10130         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10131         status = nfs4_call_sync_custom(&task_setup);
10132         dprintk("<-- %s status=%d\n", __func__, status);
10133
10134         put_cred(cred);
10135
10136         return status;
10137 }
10138
10139 static int
10140 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10141                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10142 {
10143         struct nfs4_exception exception = {
10144                 .interruptible = true,
10145         };
10146         int err;
10147         do {
10148                 /* first try using integrity protection */
10149                 err = -NFS4ERR_WRONGSEC;
10150
10151                 /* try to use integrity protection with machine cred */
10152                 if (_nfs4_is_integrity_protected(server->nfs_client))
10153                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10154                                                           flavors, true);
10155
10156                 /*
10157                  * if unable to use integrity protection, or SECINFO with
10158                  * integrity protection returns NFS4ERR_WRONGSEC (which is
10159                  * disallowed by spec, but exists in deployed servers) use
10160                  * the current filesystem's rpc_client and the user cred.
10161                  */
10162                 if (err == -NFS4ERR_WRONGSEC)
10163                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10164                                                           flavors, false);
10165
10166                 switch (err) {
10167                 case 0:
10168                 case -NFS4ERR_WRONGSEC:
10169                 case -ENOTSUPP:
10170                         goto out;
10171                 default:
10172                         err = nfs4_handle_exception(server, err, &exception);
10173                 }
10174         } while (exception.retry);
10175 out:
10176         return err;
10177 }
10178
10179 static int
10180 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10181                     struct nfs_fsinfo *info)
10182 {
10183         int err;
10184         struct page *page;
10185         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10186         struct nfs4_secinfo_flavors *flavors;
10187         struct nfs4_secinfo4 *secinfo;
10188         int i;
10189
10190         page = alloc_page(GFP_KERNEL);
10191         if (!page) {
10192                 err = -ENOMEM;
10193                 goto out;
10194         }
10195
10196         flavors = page_address(page);
10197         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10198
10199         /*
10200          * Fall back on "guess and check" method if
10201          * the server doesn't support SECINFO_NO_NAME
10202          */
10203         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10204                 err = nfs4_find_root_sec(server, fhandle, info);
10205                 goto out_freepage;
10206         }
10207         if (err)
10208                 goto out_freepage;
10209
10210         for (i = 0; i < flavors->num_flavors; i++) {
10211                 secinfo = &flavors->flavors[i];
10212
10213                 switch (secinfo->flavor) {
10214                 case RPC_AUTH_NULL:
10215                 case RPC_AUTH_UNIX:
10216                 case RPC_AUTH_GSS:
10217                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10218                                         &secinfo->flavor_info);
10219                         break;
10220                 default:
10221                         flavor = RPC_AUTH_MAXFLAVOR;
10222                         break;
10223                 }
10224
10225                 if (!nfs_auth_info_match(&server->auth_info, flavor))
10226                         flavor = RPC_AUTH_MAXFLAVOR;
10227
10228                 if (flavor != RPC_AUTH_MAXFLAVOR) {
10229                         err = nfs4_lookup_root_sec(server, fhandle,
10230                                                    info, flavor);
10231                         if (!err)
10232                                 break;
10233                 }
10234         }
10235
10236         if (flavor == RPC_AUTH_MAXFLAVOR)
10237                 err = -EPERM;
10238
10239 out_freepage:
10240         put_page(page);
10241         if (err == -EACCES)
10242                 return -EPERM;
10243 out:
10244         return err;
10245 }
10246
10247 static int _nfs41_test_stateid(struct nfs_server *server,
10248                 nfs4_stateid *stateid,
10249                 const struct cred *cred)
10250 {
10251         int status;
10252         struct nfs41_test_stateid_args args = {
10253                 .stateid = stateid,
10254         };
10255         struct nfs41_test_stateid_res res;
10256         struct rpc_message msg = {
10257                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10258                 .rpc_argp = &args,
10259                 .rpc_resp = &res,
10260                 .rpc_cred = cred,
10261         };
10262         struct rpc_clnt *rpc_client = server->client;
10263
10264         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10265                 &rpc_client, &msg);
10266
10267         dprintk("NFS call  test_stateid %p\n", stateid);
10268         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10269         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10270                         &args.seq_args, &res.seq_res);
10271         if (status != NFS_OK) {
10272                 dprintk("NFS reply test_stateid: failed, %d\n", status);
10273                 return status;
10274         }
10275         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10276         return -res.status;
10277 }
10278
10279 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10280                 int err, struct nfs4_exception *exception)
10281 {
10282         exception->retry = 0;
10283         switch(err) {
10284         case -NFS4ERR_DELAY:
10285         case -NFS4ERR_RETRY_UNCACHED_REP:
10286                 nfs4_handle_exception(server, err, exception);
10287                 break;
10288         case -NFS4ERR_BADSESSION:
10289         case -NFS4ERR_BADSLOT:
10290         case -NFS4ERR_BAD_HIGH_SLOT:
10291         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10292         case -NFS4ERR_DEADSESSION:
10293                 nfs4_do_handle_exception(server, err, exception);
10294         }
10295 }
10296
10297 /**
10298  * nfs41_test_stateid - perform a TEST_STATEID operation
10299  *
10300  * @server: server / transport on which to perform the operation
10301  * @stateid: state ID to test
10302  * @cred: credential
10303  *
10304  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10305  * Otherwise a negative NFS4ERR value is returned if the operation
10306  * failed or the state ID is not currently valid.
10307  */
10308 static int nfs41_test_stateid(struct nfs_server *server,
10309                 nfs4_stateid *stateid,
10310                 const struct cred *cred)
10311 {
10312         struct nfs4_exception exception = {
10313                 .interruptible = true,
10314         };
10315         int err;
10316         do {
10317                 err = _nfs41_test_stateid(server, stateid, cred);
10318                 nfs4_handle_delay_or_session_error(server, err, &exception);
10319         } while (exception.retry);
10320         return err;
10321 }
10322
10323 struct nfs_free_stateid_data {
10324         struct nfs_server *server;
10325         struct nfs41_free_stateid_args args;
10326         struct nfs41_free_stateid_res res;
10327 };
10328
10329 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10330 {
10331         struct nfs_free_stateid_data *data = calldata;
10332         nfs4_setup_sequence(data->server->nfs_client,
10333                         &data->args.seq_args,
10334                         &data->res.seq_res,
10335                         task);
10336 }
10337
10338 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10339 {
10340         struct nfs_free_stateid_data *data = calldata;
10341
10342         nfs41_sequence_done(task, &data->res.seq_res);
10343
10344         switch (task->tk_status) {
10345         case -NFS4ERR_DELAY:
10346                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10347                         rpc_restart_call_prepare(task);
10348         }
10349 }
10350
10351 static void nfs41_free_stateid_release(void *calldata)
10352 {
10353         struct nfs_free_stateid_data *data = calldata;
10354         struct nfs_client *clp = data->server->nfs_client;
10355
10356         nfs_put_client(clp);
10357         kfree(calldata);
10358 }
10359
10360 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10361         .rpc_call_prepare = nfs41_free_stateid_prepare,
10362         .rpc_call_done = nfs41_free_stateid_done,
10363         .rpc_release = nfs41_free_stateid_release,
10364 };
10365
10366 /**
10367  * nfs41_free_stateid - perform a FREE_STATEID operation
10368  *
10369  * @server: server / transport on which to perform the operation
10370  * @stateid: state ID to release
10371  * @cred: credential
10372  * @privileged: set to true if this call needs to be privileged
10373  *
10374  * Note: this function is always asynchronous.
10375  */
10376 static int nfs41_free_stateid(struct nfs_server *server,
10377                 const nfs4_stateid *stateid,
10378                 const struct cred *cred,
10379                 bool privileged)
10380 {
10381         struct rpc_message msg = {
10382                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10383                 .rpc_cred = cred,
10384         };
10385         struct rpc_task_setup task_setup = {
10386                 .rpc_client = server->client,
10387                 .rpc_message = &msg,
10388                 .callback_ops = &nfs41_free_stateid_ops,
10389                 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10390         };
10391         struct nfs_free_stateid_data *data;
10392         struct rpc_task *task;
10393         struct nfs_client *clp = server->nfs_client;
10394
10395         if (!refcount_inc_not_zero(&clp->cl_count))
10396                 return -EIO;
10397
10398         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10399                 &task_setup.rpc_client, &msg);
10400
10401         dprintk("NFS call  free_stateid %p\n", stateid);
10402         data = kmalloc(sizeof(*data), GFP_KERNEL);
10403         if (!data)
10404                 return -ENOMEM;
10405         data->server = server;
10406         nfs4_stateid_copy(&data->args.stateid, stateid);
10407
10408         task_setup.callback_data = data;
10409
10410         msg.rpc_argp = &data->args;
10411         msg.rpc_resp = &data->res;
10412         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10413         task = rpc_run_task(&task_setup);
10414         if (IS_ERR(task))
10415                 return PTR_ERR(task);
10416         rpc_put_task(task);
10417         return 0;
10418 }
10419
10420 static void
10421 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10422 {
10423         const struct cred *cred = lsp->ls_state->owner->so_cred;
10424
10425         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10426         nfs4_free_lock_state(server, lsp);
10427 }
10428
10429 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10430                 const nfs4_stateid *s2)
10431 {
10432         if (s1->type != s2->type)
10433                 return false;
10434
10435         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10436                 return false;
10437
10438         if (s1->seqid == s2->seqid)
10439                 return true;
10440
10441         return s1->seqid == 0 || s2->seqid == 0;
10442 }
10443
10444 #endif /* CONFIG_NFS_V4_1 */
10445
10446 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10447                 const nfs4_stateid *s2)
10448 {
10449         return nfs4_stateid_match(s1, s2);
10450 }
10451
10452
10453 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10454         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10455         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10456         .recover_open   = nfs4_open_reclaim,
10457         .recover_lock   = nfs4_lock_reclaim,
10458         .establish_clid = nfs4_init_clientid,
10459         .detect_trunking = nfs40_discover_server_trunking,
10460 };
10461
10462 #if defined(CONFIG_NFS_V4_1)
10463 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10464         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10465         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10466         .recover_open   = nfs4_open_reclaim,
10467         .recover_lock   = nfs4_lock_reclaim,
10468         .establish_clid = nfs41_init_clientid,
10469         .reclaim_complete = nfs41_proc_reclaim_complete,
10470         .detect_trunking = nfs41_discover_server_trunking,
10471 };
10472 #endif /* CONFIG_NFS_V4_1 */
10473
10474 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10475         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10476         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10477         .recover_open   = nfs40_open_expired,
10478         .recover_lock   = nfs4_lock_expired,
10479         .establish_clid = nfs4_init_clientid,
10480 };
10481
10482 #if defined(CONFIG_NFS_V4_1)
10483 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10484         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10485         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10486         .recover_open   = nfs41_open_expired,
10487         .recover_lock   = nfs41_lock_expired,
10488         .establish_clid = nfs41_init_clientid,
10489 };
10490 #endif /* CONFIG_NFS_V4_1 */
10491
10492 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10493         .sched_state_renewal = nfs4_proc_async_renew,
10494         .get_state_renewal_cred = nfs4_get_renew_cred,
10495         .renew_lease = nfs4_proc_renew,
10496 };
10497
10498 #if defined(CONFIG_NFS_V4_1)
10499 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10500         .sched_state_renewal = nfs41_proc_async_sequence,
10501         .get_state_renewal_cred = nfs4_get_machine_cred,
10502         .renew_lease = nfs4_proc_sequence,
10503 };
10504 #endif
10505
10506 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10507         .get_locations = _nfs40_proc_get_locations,
10508         .fsid_present = _nfs40_proc_fsid_present,
10509 };
10510
10511 #if defined(CONFIG_NFS_V4_1)
10512 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10513         .get_locations = _nfs41_proc_get_locations,
10514         .fsid_present = _nfs41_proc_fsid_present,
10515 };
10516 #endif  /* CONFIG_NFS_V4_1 */
10517
10518 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10519         .minor_version = 0,
10520         .init_caps = NFS_CAP_READDIRPLUS
10521                 | NFS_CAP_ATOMIC_OPEN
10522                 | NFS_CAP_POSIX_LOCK,
10523         .init_client = nfs40_init_client,
10524         .shutdown_client = nfs40_shutdown_client,
10525         .match_stateid = nfs4_match_stateid,
10526         .find_root_sec = nfs4_find_root_sec,
10527         .free_lock_state = nfs4_release_lockowner,
10528         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10529         .alloc_seqid = nfs_alloc_seqid,
10530         .call_sync_ops = &nfs40_call_sync_ops,
10531         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10532         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10533         .state_renewal_ops = &nfs40_state_renewal_ops,
10534         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10535 };
10536
10537 #if defined(CONFIG_NFS_V4_1)
10538 static struct nfs_seqid *
10539 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10540 {
10541         return NULL;
10542 }
10543
10544 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10545         .minor_version = 1,
10546         .init_caps = NFS_CAP_READDIRPLUS
10547                 | NFS_CAP_ATOMIC_OPEN
10548                 | NFS_CAP_POSIX_LOCK
10549                 | NFS_CAP_STATEID_NFSV41
10550                 | NFS_CAP_ATOMIC_OPEN_V1
10551                 | NFS_CAP_LGOPEN
10552                 | NFS_CAP_MOVEABLE,
10553         .init_client = nfs41_init_client,
10554         .shutdown_client = nfs41_shutdown_client,
10555         .match_stateid = nfs41_match_stateid,
10556         .find_root_sec = nfs41_find_root_sec,
10557         .free_lock_state = nfs41_free_lock_state,
10558         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10559         .alloc_seqid = nfs_alloc_no_seqid,
10560         .session_trunk = nfs4_test_session_trunk,
10561         .call_sync_ops = &nfs41_call_sync_ops,
10562         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10563         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10564         .state_renewal_ops = &nfs41_state_renewal_ops,
10565         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10566 };
10567 #endif
10568
10569 #if defined(CONFIG_NFS_V4_2)
10570 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10571         .minor_version = 2,
10572         .init_caps = NFS_CAP_READDIRPLUS
10573                 | NFS_CAP_ATOMIC_OPEN
10574                 | NFS_CAP_POSIX_LOCK
10575                 | NFS_CAP_STATEID_NFSV41
10576                 | NFS_CAP_ATOMIC_OPEN_V1
10577                 | NFS_CAP_LGOPEN
10578                 | NFS_CAP_ALLOCATE
10579                 | NFS_CAP_COPY
10580                 | NFS_CAP_OFFLOAD_CANCEL
10581                 | NFS_CAP_COPY_NOTIFY
10582                 | NFS_CAP_DEALLOCATE
10583                 | NFS_CAP_SEEK
10584                 | NFS_CAP_LAYOUTSTATS
10585                 | NFS_CAP_CLONE
10586                 | NFS_CAP_LAYOUTERROR
10587                 | NFS_CAP_READ_PLUS
10588                 | NFS_CAP_MOVEABLE,
10589         .init_client = nfs41_init_client,
10590         .shutdown_client = nfs41_shutdown_client,
10591         .match_stateid = nfs41_match_stateid,
10592         .find_root_sec = nfs41_find_root_sec,
10593         .free_lock_state = nfs41_free_lock_state,
10594         .call_sync_ops = &nfs41_call_sync_ops,
10595         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10596         .alloc_seqid = nfs_alloc_no_seqid,
10597         .session_trunk = nfs4_test_session_trunk,
10598         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10599         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10600         .state_renewal_ops = &nfs41_state_renewal_ops,
10601         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10602 };
10603 #endif
10604
10605 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10606         [0] = &nfs_v4_0_minor_ops,
10607 #if defined(CONFIG_NFS_V4_1)
10608         [1] = &nfs_v4_1_minor_ops,
10609 #endif
10610 #if defined(CONFIG_NFS_V4_2)
10611         [2] = &nfs_v4_2_minor_ops,
10612 #endif
10613 };
10614
10615 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10616 {
10617         ssize_t error, error2, error3;
10618         size_t left = size;
10619
10620         error = generic_listxattr(dentry, list, left);
10621         if (error < 0)
10622                 return error;
10623         if (list) {
10624                 list += error;
10625                 left -= error;
10626         }
10627
10628         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left);
10629         if (error2 < 0)
10630                 return error2;
10631
10632         if (list) {
10633                 list += error2;
10634                 left -= error2;
10635         }
10636
10637         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left);
10638         if (error3 < 0)
10639                 return error3;
10640
10641         error += error2 + error3;
10642         if (size && error > size)
10643                 return -ERANGE;
10644         return error;
10645 }
10646
10647 static void nfs4_enable_swap(struct inode *inode)
10648 {
10649         /* The state manager thread must always be running.
10650          * It will notice the client is a swapper, and stay put.
10651          */
10652         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10653
10654         nfs4_schedule_state_manager(clp);
10655 }
10656
10657 static void nfs4_disable_swap(struct inode *inode)
10658 {
10659         /* The state manager thread will now exit once it is
10660          * woken.
10661          */
10662         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10663
10664         set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10665         clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10666         wake_up_var(&clp->cl_state);
10667 }
10668
10669 static const struct inode_operations nfs4_dir_inode_operations = {
10670         .create         = nfs_create,
10671         .lookup         = nfs_lookup,
10672         .atomic_open    = nfs_atomic_open,
10673         .link           = nfs_link,
10674         .unlink         = nfs_unlink,
10675         .symlink        = nfs_symlink,
10676         .mkdir          = nfs_mkdir,
10677         .rmdir          = nfs_rmdir,
10678         .mknod          = nfs_mknod,
10679         .rename         = nfs_rename,
10680         .permission     = nfs_permission,
10681         .getattr        = nfs_getattr,
10682         .setattr        = nfs_setattr,
10683         .listxattr      = nfs4_listxattr,
10684 };
10685
10686 static const struct inode_operations nfs4_file_inode_operations = {
10687         .permission     = nfs_permission,
10688         .getattr        = nfs_getattr,
10689         .setattr        = nfs_setattr,
10690         .listxattr      = nfs4_listxattr,
10691 };
10692
10693 const struct nfs_rpc_ops nfs_v4_clientops = {
10694         .version        = 4,                    /* protocol version */
10695         .dentry_ops     = &nfs4_dentry_operations,
10696         .dir_inode_ops  = &nfs4_dir_inode_operations,
10697         .file_inode_ops = &nfs4_file_inode_operations,
10698         .file_ops       = &nfs4_file_operations,
10699         .getroot        = nfs4_proc_get_root,
10700         .submount       = nfs4_submount,
10701         .try_get_tree   = nfs4_try_get_tree,
10702         .getattr        = nfs4_proc_getattr,
10703         .setattr        = nfs4_proc_setattr,
10704         .lookup         = nfs4_proc_lookup,
10705         .lookupp        = nfs4_proc_lookupp,
10706         .access         = nfs4_proc_access,
10707         .readlink       = nfs4_proc_readlink,
10708         .create         = nfs4_proc_create,
10709         .remove         = nfs4_proc_remove,
10710         .unlink_setup   = nfs4_proc_unlink_setup,
10711         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10712         .unlink_done    = nfs4_proc_unlink_done,
10713         .rename_setup   = nfs4_proc_rename_setup,
10714         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10715         .rename_done    = nfs4_proc_rename_done,
10716         .link           = nfs4_proc_link,
10717         .symlink        = nfs4_proc_symlink,
10718         .mkdir          = nfs4_proc_mkdir,
10719         .rmdir          = nfs4_proc_rmdir,
10720         .readdir        = nfs4_proc_readdir,
10721         .mknod          = nfs4_proc_mknod,
10722         .statfs         = nfs4_proc_statfs,
10723         .fsinfo         = nfs4_proc_fsinfo,
10724         .pathconf       = nfs4_proc_pathconf,
10725         .set_capabilities = nfs4_server_capabilities,
10726         .decode_dirent  = nfs4_decode_dirent,
10727         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10728         .read_setup     = nfs4_proc_read_setup,
10729         .read_done      = nfs4_read_done,
10730         .write_setup    = nfs4_proc_write_setup,
10731         .write_done     = nfs4_write_done,
10732         .commit_setup   = nfs4_proc_commit_setup,
10733         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10734         .commit_done    = nfs4_commit_done,
10735         .lock           = nfs4_proc_lock,
10736         .clear_acl_cache = nfs4_zap_acl_attr,
10737         .close_context  = nfs4_close_context,
10738         .open_context   = nfs4_atomic_open,
10739         .have_delegation = nfs4_have_delegation,
10740         .alloc_client   = nfs4_alloc_client,
10741         .init_client    = nfs4_init_client,
10742         .free_client    = nfs4_free_client,
10743         .create_server  = nfs4_create_server,
10744         .clone_server   = nfs_clone_server,
10745         .discover_trunking = nfs4_discover_trunking,
10746         .enable_swap    = nfs4_enable_swap,
10747         .disable_swap   = nfs4_disable_swap,
10748 };
10749
10750 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10751         .name   = XATTR_NAME_NFSV4_ACL,
10752         .list   = nfs4_xattr_list_nfs4_acl,
10753         .get    = nfs4_xattr_get_nfs4_acl,
10754         .set    = nfs4_xattr_set_nfs4_acl,
10755 };
10756
10757 #if defined(CONFIG_NFS_V4_1)
10758 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10759         .name   = XATTR_NAME_NFSV4_DACL,
10760         .list   = nfs4_xattr_list_nfs4_dacl,
10761         .get    = nfs4_xattr_get_nfs4_dacl,
10762         .set    = nfs4_xattr_set_nfs4_dacl,
10763 };
10764
10765 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10766         .name   = XATTR_NAME_NFSV4_SACL,
10767         .list   = nfs4_xattr_list_nfs4_sacl,
10768         .get    = nfs4_xattr_get_nfs4_sacl,
10769         .set    = nfs4_xattr_set_nfs4_sacl,
10770 };
10771 #endif
10772
10773 #ifdef CONFIG_NFS_V4_2
10774 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10775         .prefix = XATTR_USER_PREFIX,
10776         .get    = nfs4_xattr_get_nfs4_user,
10777         .set    = nfs4_xattr_set_nfs4_user,
10778 };
10779 #endif
10780
10781 const struct xattr_handler * const nfs4_xattr_handlers[] = {
10782         &nfs4_xattr_nfs4_acl_handler,
10783 #if defined(CONFIG_NFS_V4_1)
10784         &nfs4_xattr_nfs4_dacl_handler,
10785         &nfs4_xattr_nfs4_sacl_handler,
10786 #endif
10787 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10788         &nfs4_xattr_nfs4_label_handler,
10789 #endif
10790 #ifdef CONFIG_NFS_V4_2
10791         &nfs4_xattr_nfs4_user_handler,
10792 #endif
10793         NULL
10794 };